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【单选题】
容积恒定的车胎内部气压要维持恒定，那么车胎内空气质量最多的季节为( )。A.
秋季
B.
春季
C.
冬季
D.
夏季
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反馈参考答案：
举一反三
【单选题】Edge and screw dislocations differ in what way?
A.
1 magnitude of their Burgers vectors
B.
line direction is straight (edge) or curved (screw)
C.
angle between Burgers vector and line direction
D.
None of above
【简答题】（ ）cover shipment from or to ports involving transport by two or more shipping or railways companies．
【单选题】As I will be away for at least a year, I’d appreciate _____ from you now and then so that I can know how everyone is getting along.
A.
having heard
B.
to hear
C.
hearing
D.
being heard
【单选题】A technician is trying to retrieve a screw that fell inside a case and is just out of reach. Which of the following is the BEST procedure to retrieve the screw?（）
A.
Turn the case upside down, shake gently and let the screw fall out.
B.
Use a shop vacuum to retrieve the screw.
C.
Use the hardware abstraction layer (HAL).
D.
Use an extension magnet.
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