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【简答题】
如下图所示,已知 V =10米/分, n 1=10000转/分, n 2=-9000转/分, η =80%,求捻度 T 1、 T 2 、 T 3 、 T 4。
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举一反三
【单选题】________ what had happened, they knew I would struggle and simply wanted to help because it was the right thing to do.
A.
Hearing
B.
To have heard
C.
Having heard
D.
Heard
【单选题】I really wanted to help those homeless children in the flooded areas, ______ I donated all the pocket money that I had saved for months.
A.
so
B.
because
C.
since
D.
for
【单选题】I had wanted to help you last night but I couldn't spare any time, for I＿＿＿a composition which I have to hand in this morning.
A.
wrote
B.
was writing
C.
had written
D.
have written
【单选题】We can conclude from the passage that the author ______.
A.
tries to justify the youth-oriented, throw-away culture of the American society
B.
suggests that people should not retire at the age of 65 or 70
C.
thinks that the value of older Americans is gaining increasing recognition
D.
thinks young people should give more respect to old people
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