题目内容

It（）exactly thirty years since I graduated from college.

A. was
B. has been
C. was be
D. had bee

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下列战役与成语“围魏救赵”有关的是（）。

A. 桂陵战役
B. 马陵战役
C. 成濮之战
D. 长平之战

沥青混合料路面抗滑性能与沥青含蜡量无关。

A. 正确
B. 错误

超声波通过二种材料的界面传递，如果第一介质声阻抗较大，但声速与第二介质相同则折射角（）入射角。

Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）

A. engine support vibration isolator
B. detuner or viscous fluid damper
C. lightened crankshaft flywheel
D. spherically seated crankshaft bearing