Which substance is NOT considered to be Oil under the pollution prevention regulations? （）

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  A . exposure limits B . concentration limits C . threshold limit values D . substance limit value

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• The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as （）.

  A . chemical ignition B . spontaneous combustion C . chemical combustion D . radiation ignitio

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• Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）

  A . Impurities B . Lube oil C . Gasoline D . Diesel fuel

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  A . chemicals B . chemicals or other substances C . substances D . other substance

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• Electric insulation is made of organic substances and so gradually （） with age.

  A . deteriorates B . increases C . are fouled D . becomes better

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• Why is a special substance painted on the tree?

  A . A. To make a wound smooth. B . B. To prevent disease entering a wound. C . C. To cover a rough surface. D . D. To help a wound to dry.

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• The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of （）.

  A . fusion B . vaporization C . condensation D . sublimatio

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• A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is（）

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• What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）

  A . Refrigerator B . Refrigerant C . Cooling medium D . Brine

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• The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called （）.

  A . explosive range B . flash point C . ignition temperature D . combustion temperature

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• Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?（）

  A . Radiation B . Conduction C . Natural convection D . All of the above

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• A vessel emitting harmful substances into the air or spilling oil into the sea is a（）.

  A . polluter B . emitter C . spiller D . oiler

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• Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?（）

  A . Sludge B . Gasoline C . Fuel oil D . Lube oil

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• Light is a harmful substance.

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• Coral is a kind of small organism called limestone living within a skeleton made of a substance called polyps.

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• which substance in body contains iron?

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• 121.A vessel emitting harmful substances into the air or spilling oil into the sea is a( )。

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• A solution of which substance can best be used as both a titrant and its own indicator in an oxidation-reduction titration？

  (a) I₂(b) NaOCl (c) K₂Cr₂O₇(d) KMnO₄

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• If a substance is dissolved in water or heated, it may-______ a gas.

  A．give into B．give over C．give off D．give away

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• Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — VitaminC

  A．have taken B．have been taking C．have been taken D．have being taken

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• It is generally agreed that we may use this substance （)soap.

  A.in the place of B.in place of C.in place D. out of place

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• Many science reports discuss medical studies that test the effect of a new drug. Usually, a large number of people is divided into two groups. Each group takes a different substance. But no one knows which group is getting which substance. One group takes the medicine being tested. Another group takes what we call an inactive substance. Medical researchers call this substance a "placebo." The word "placebo" is Latin for "I shall please." Placebo pills(宽心丸)usually are made of sugar.

  Using placebos to test drugs sometimes has a surprising result. Researchers say people taking the placebo often report improvements in their health. This is known as "the placebo effect"--pain that is eased or stopped by an inactive substance. In such testing, the drug must perform. better than the placebo to prove that it is effective. Doctors have reported that the placebo effect can be used in treatment. For example, a doctor tells a patient that a new drug will stop the pain in his leg. The pill is only sugar. But the patient does not know that. He takes the pill and says his pain is gone. Scientists are beginning to discover some physical reasons for this reaction in some people. They are learning that much of what people believe to be true comes from what the brain expects is going to happen. If the brain believes a drug will ease pain, the brain may begin physical changes in the body that can cause the expected effect. A recent examination of studies on drugs for depression found that placebos eased the depression about as well as the active drugs. Other studies have explored the power of placebos. A study in Japan involved thirteen people who reacted to the poison ivy (常青藤)plant. Poison-ivy causes red itchy sores(伤痕)on some people who touch it. Each person was rubbed on one arm with a harmless leaf, but was told it was poison ivy. Each person was then touched on the other arm with poison ivy, but was told it was a harmless leaf. All thirteen people developed a reaction on the arm where the harmless leaf touched their skin. Only two reacted to the poison ivy leaves. Doctors and scientists worry that the use of placebos may not always be harmless. They say people can become victims of false doctors and others who use placebos to claim they can cure disease. What do medical researchers usually use to make placebo pills？ A．Ivy leaves. B．Harmless leaves. C．Medicine being tested. D．sugar.

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• The quality of a batch of drug substances is judged according to

  A．product appearance B．the inspection report C．product melting point D．product color

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• Which one is correct of the following descriptions about the transport mechanism of macromolecular substances（）

  A．Signal-regulated secretion requires the participation of clathrin, whereas continuous secretion is not required B．The specificity of the transporter is regulated by clathrin and adaptin in the composition of the vesicles C．Receptor-mediated transport needs protein or protein complex to associate with a specific receptor in the cell membrane D．Insulin secretion is endocytosis

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