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【单选题】
短路电流运算曲线编制时,计算电抗仅编制到3.5,其原因是( )。A.
对于计算电抗大于3.5的电源可以视为无限大功率电源,其任意时刻的短路电流周期分量有效值,就是短路瞬间短路电流周期分量的起始有效值
B.
实际工程上不存在计算电抗大于3.5的情况
C.
由于计算电抗大于3.5的电源,其向短路点提供的短路电流很小,实际计算可以忽略
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【单选题】电容式液位计是通过电容传感器把液位转换为电容量的变化，然后再通过测量电容量来求知液位，因而这种液位计（）。
A.
只能测量导电液体的液位
B.
只能测量非导电液体的液位
C.
根据传感器形式的不同既可测量导电液体的液位，也可测量非导电液体的液位
D.
只能测量介电常数较大的液体的液位
【单选题】听力原文： Captain Joseph Mackey's airplane was flying over the ocean on its way to Great Britain when engine trouble started. He turned back and made a crash-landing at night in the deep snow of Newfoundl...
A.
No fuel.
B.
Ice on the wing.
C.
Engine trouble.
D.
No food.
【单选题】听力原文： Captain Joseph Mackey's airplane was flying over the ocean on its way to Great Britain when engine trouble started. He turned back and made a crash landing at night in the deep snow of Newfoundl...
A.
No fuel.
B.
Ice on the wing.
C.
Engine trouble.
D.
No food.
【简答题】若要使摩擦轮传动能够正常工作,必须使两轮之间产生的 大于从动轮上的 。
【简答题】若使摩擦轮传动能够正常工作,必须使两轮之间产生的 足以克服从动轮上的 。
【单选题】Twenty-six journalists from 19 media organizations of different countries and regions are the first ones_______ the unrest of “the Red-shirts” in Tailand capital.
A.
covered
B.
covers
C.
to cover
D.
covering
【单选题】听力原文： Captain Joseph Mackey's airplane was flying over the ocean on its way to Great Britain when engine trouble started. He turned back and made a crash-landing at night in the deep snow of Newfoundl...
A.
No fuel.
B.
Ice on the wing.
C.
Engine trouble.
D.
No food.
【单选题】Captain Sentry retired to the country because he was ______.
A.
bitter about his rank
B.
Sir Roger's heir
C.
too modest to be noticed by his superiors
D.
accustomed to obeying people above him
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