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【判断题】
抽油机曲柄销的作用只是将曲柄和连杆连接在一起，而不承担负荷。A.
正确
B.
错误
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举一反三
【单选题】—Can you go swimming with us this afternoon? —Sorry. I ______ look after my little sister at home.
A.
can
B.
may
C.
would
D.
have to
【单选题】—Can you go swimming with us this afternoon? —Sorry. I ______ look after my little sister at home.
A.
have to
B.
can
C.
may
D.
would
【单选题】Can you go swimming with us this afternoon? Sorry, I can't. I ______take care of my little sister at home because my mother is ill.
A.
can
B.
may
C.
would
D.
have to
【简答题】科学家艾弗里和他的同事们,通过著名的细菌转化实验,第一次证明了遗传物质是DNA。
【单选题】—can you go swimming with us this afternoon? —Sorry, I can't. I______ do the chores at home. [ ]
A.
can
B.
could
C.
can't
D.
have to
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