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【简答题】
若进、出控制体的物料均为连续流股,各流股的质量流量均恒定, ∑Mi=∑Mo,控制体内位置物料的所有参量—如温度、压强、组成、流速等都不随时间而改变,则该控制体处于___________过程。
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【单选题】Hourly out put by workers ____ 1.3% in the first quarter.
A.
reduced
B.
declined
C.
felled
D.
slowed
【简答题】Wang Fang ________ the fire ________ a blanket. [ ] A. put out; with B . put off; for C. put out; in D. put down; at
【单选题】They _______ the fire and helped the old man out. [ ]
A.
put out
B.
put on
C.
worked out
D.
went out
【单选题】How did the girl _______ the fire and helped Mr. Sun out? [ ]
A.
put on
B.
put off
C.
put out
D.
put up
【单选题】—Look! 'No smoking!' Can you _____? —I'm sorry, I will. [ ]
A.
put out it
B.
put it on
C.
put it out
D.
put on it
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