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【单选题】
下列能够得到最佳的超声反射是A.
入射波与反射界面平行
B.
入射波与声阻抗不同的界面垂直
C.
入射波发生绕射、衍射、折射及反射
D.
声射与反射间的夹角>90°
E.
声射与反射间的夹角<90°
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举一反三
【简答题】阅读理解 I used to watch her from my kitchen window. She seemed so small as she muscled her way through the crowd of boys on the playground. The school was across the street from our home and I would ofte...
【单选题】In practice, it is usual for ship to be loaded _____ to improve the vessel’s movement through the water.
A.
a little deeper aft
B.
a little deeper forward
C.
at the same draught between fore and aft
D.
a balance between two sides
【单选题】Which of the following is NOT true about the Times?
A.
Murdoch began to become famous through the purchase of The Times.
B.
When John Walter III controlled the paper, he built the reputation of The Times.
C.
The Times is the most popular newspaper in the U.K.
D.
It was the founder, John Walter, who changed the name to The Times.
【单选题】According to the author, an ideal relationship between husband and wife is obtainable through
A.
constant communication
B.
perfect personality
C.
quitting quarrelling
D.
being understandable and considerate
【简答题】thro t 咽喉,喉咙
【单选题】The purpose of the flywheel of a diesel engine is to _____.
A.
counterbalance the crank throws on the crankshaft
B.
keep the engine running smoothly between power stroke
C.
provide a belt-driving surface for the operation of auxiliary machinery
D.
prevent the engine from overspeeding
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