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【单选题】
若a=1,b=2,c=3,d=4，则后缀式db/cc*a-b*+的运算结果为(56)。A.
9/22
B.
18
C.
20
D.
24
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A.
正确
B.
错误
【单选题】You are _____ to my dictionary. Whenever you need it, just tell me.
A.
welcome
B.
comparable
C.
convenient
D.
relative
【单选题】—What do you find hardest in English? —________. —Well, you just need lots of practice. Why don't you buy a radio? The more you listen to English, the easier it becomes.
A.
I find listening really hard. Sometimes it's just impossible to understand.
B.
I'm limited in vocabulary, which influences my reading and writing.
C.
I don't like English at all.
【单选题】You ______ to tell him the news; It just made him sad. [ ]
A.
need not
B.
doesn't need
C.
need
D.
don't need
【简答题】You don’t need to speak French to understand the Parisians. You just need to know how to make gestures. A new guide has come out by French tourism officials, which is to help foreign visitors understa...
【多选题】只适用于刚体的公理、定理有( )
A.
二力平衡公理
B.
加减平衡力系公理
C.
平行四边形法则
D.
作用力与反作用力定律
E.
力的可传性原理
F.
三力平衡汇交定理
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