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【简答题】
某普通V带传动,传递功率P=7.5KW,带速v=10m/s,紧边拉力是拉力的两倍(F1=2F2),则F1=____N和F2=____N。
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【单选题】You _____ come, but why didn't you appear? [ ]
A.
must have
B.
should have
C.
need have
D.
ought have
【单选题】When the library doesn't have the magazine you need, you______.
A.
have to go to another library for it
B.
can ask the librarian to buy a copy for you
C.
can ask the librarian to go to other libraries for it
D.
can borrow it from another library but don't have to go there
【简答题】影响动物采食量的因素有哪些?
【单选题】You ________here tomorrow if you have something important to do. [ ]
A.
needn't to come
B.
don't need to come
C.
needn't coming
D.
don't need coming
【简答题】采食量对动物生产效率有何影响？影响动物采食量的主要因素有哪些？
【单选题】—Have you brought with you? We won’t have time to come back. —Don’t worry. All the things we need are here, in this big bag.
A.
something
B.
anything
C.
nothing
D.
everything
【简答题】影响动物采食量的因素有哪些？
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