Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however ().
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Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?()
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when (),the provisions of the Bill of Lading will be used as a basis for settlement.
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As our foreign teachers’ suggest, when you deliver a speech, you’d better use your own personal experiences to show your own opinions.____________
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1.We should use as many props as possible when giving a speech to make it vivid and dynamic.
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Try to avoid the habit of using possessive pronouns when describing coworkers, such as my assistant.()
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When the relief valve is used as a constant pressure valve, it is connected to the outlet of the hydraulic pump to ensure that the outlet pressure of the hydraulic system (pump) is constant.
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“Sorry” is used as an advance apology for troubling somebody, as when passing in front of him or interrupting his conversation.()
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