火星的质量和半径分别约为地球的和，地球表面的重力加速度为g，

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问题不定项选择

火星的质量和半径分别约为地球的和，地球表面的重力加速度为g，则火星表面的重力加速度约为 [ ]

A．0.2g 

B．0.4g 

C．2.5g 

D．5g

答案

答案：B

填空题

用恰当的介词、连词或aware的恰当词性填空。

1. Also when you set your goals in a particular way you are able to make yourself continuously aware ____

situations that will bring you nearer to your goal.

2. The principal didn't seem to be aware ____ there should have been so much dispute about the decision.

3. Health officials throughout the world have tried to make people raise ____ about AIDS.

4. Mike seems ____ of the trouble he's causing, otherwise he would stop it.

问答题简答题

简述主板的故障种类。