A variable star is one that（）.

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• An employee cannot access the company database. You check the connection variables: https://assets.asklib.com/images/image2/2018080117475999780.jpg What is a valid explanation for why one of the users is unable to connect to the database?（）

  A . Bob has max_user_connections set to zero, which blocks all his connections B . Joe has exceeded the max_user_connections global limit C . All users are blocked because max_user_connections is accumulated over the host account information D . Kay is already connected elsewhere and attempting to log in again E . Connect_timeout is too small to allow a connection to occur

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• he system administrator is making system wide changes to a server， which will add to the PATH variable for the server environment.  Where is the PATH variable found for the system？（）

  A . /profile B . /etc/envpath C . /etc/profile D . /etc/environment

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• The system administrator is making system wide changes to a server， which will add to the PATH variable for the server environment.  Where is the PATH variable found for the system？（）  

  A . /profile B . /etc/envpath C . /etc/profile D . /etc/environment

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• A double star is a star that（）.

  A . has a declination equal to twice that of the Sun B . comprises two stars that appear close together C . is twice as bright as a single star D . suddenly becomes much brighter and then fade

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• The system administrator is making system wide changes to a server, which will add to the PATH variable for the server environment. Where is the PATH variable found for the system?（）

  A . /profile B . /etc/envpath C . /etc/profile D . /etc/environment

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• In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have（）.

  A . reset action B . proportional action C . two position action D . rate actio

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• A large group of stars revolving around a center is known as a（）.

  A . cluster B . shower C . constellation D . galaxy

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• A public member vairable called MAX_LENGTH which is int type， the value of the variable remains constant value 100. Use a short statement to define the variable.（）   

  A .  public int MAX_LENGTH=100； B .  final int MAX_LENGTH=100； C .  final public int MAX_LENGTH=100； D .  public final int MAX_LENGTH=100；

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• The girl is（）of a film star.

  A . somebody B . something C . anybody D . anything

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• Several @functions can execute multiple statements. Which one of the following initializes a variable and can increment in during the operation?（）

  A .  @do  B .  @for  C .  @while  D .  @dowhile&e

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• Which statement of assigning a long type variable to a hexadecimal value is correct？（）

  A .  long number = 345L； B .  long number = 0345； C .  long number = 0345L； D .  long number = 0x345L；

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• A first magnitude star is（）.

  A . 2.5 times as bright as a second magnitude star B . 3 times as bright as a second magnitude star C . 5 times as bright as a second magnitude star D . 10 times as bright as a second magnitude star

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• The usual number of single-acting pistons used in a variable stroke axial-piston pump is （）.

  A、3 or 5 B、5 or 7 C、7 or 9 D、9 or 11

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• temp=’this is a temped variable’；echo foo${temp}上述命令执行的结果为（）

  A . foo B . foo$temp C . foo’this is a temped variable’ D . foothis is a temped variable

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• A star that suddenly becomes several magnitudes brighter and then gradually fades is a（）.

  A . double star B . variable star C . nova D . nebula

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• The complement of a product of variables is equal to the sum of the complements of each variable is a statement of DeMorgen's theorem

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• Given the following variables: spot price is $55, exercise price is $75, time period is one year, risk-free rate is 5 %, and put option’s price is $20; if the call option is selling for $10, how much

  A．$3.57 B．$6.43 C．$10 D．$15

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• Millions of stars are traveling about in space. A few form. groups which journey together, but most of them travel alone. And they travel through a universe so large that one star seldom comes near to another.

  We believe, however, that some two thousand million years ago, another star wandering through space, happened to come near our sun. Just as the sun and the moon raise tides on the earth, so this star must have raised tides on the surface of the sun. But they were very different from the small tides that are raised in our oceans; a large tidal wave' must have travelled over the surface of the sun, at last forming a mountain so high that we cannot imagine it. As the cause of the disturbance (动荡) came nearer, so the mountain rose higher and higher. And before the star began to move away again, its tidal pull had become so powerful that this mountain was torn to pieces and threw off small parts of itself into space. These small pieces have been going round the sun ever since. They are the planets (行星). Millions of stars are______. A．following a regular path in space B．always travelling together C．seldom wandering about in the universe D．moving about without a fixed course

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• The addition to total variable cost when one more unit of output is produced is called______.

  A．total cost B．marginal cost C．fixed cost D．average variable cost

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• Jeremy Lin, _____ NBA star, is one of _____ few basketball players who are very popular with many of his Chinese fans. A an; theB an; aC a; theD the, a

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• If a variable is measured in feet, its units on the variance will also be in feet, true or false？

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• The amount of time necessary for assembly line workers to complete a product is a normal random variable with a mean of 15 minutes and a standard deviation of 2 minutes. The probability is__ that a pr

  A．0.6826 B．0.9544 C．0.9772 D．0

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• A continuous signal is also called because its waveform is often analogous to that of the physical variable（）

  A．an analog signal B．a discrete signal C．a digital signal D．a sampled signal

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