两根相同直径的圆管，以同样的速度输送水和空气，不会出现（）情况
A. 水管内为层流状态，气管内为紊流状态；
B. 水管，气管内都为层流状态；
C. 水管内为紊流状态，气管内为层流状态；
D. 水管，气管内都为紊流状态。
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Steve uncorked bottles of champagne to toast the ____________ .
A. achieve
B. achieving
C. achieved
D. achievement
The troop was armed with the most _________ weapons.
A. advancement
B. advancing
C. advanced
D. advance
If I might _________ a guess , I'd say she was about thirty.
A. hazard
B. hazards
C. hazarding
D. hazard
The news plunged them into deep __________ .
A. depress
B. depressing
C. depressed
D. depression
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