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【单选题】
下列运算符合法的是:A.
&&
B.
<>
C.
if
D.
=
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反馈参考答案：
举一反三
【单选题】Watch this,Mum! I_______________stand on one leg.
A.
can
B.
can't
C.
could
D.
couldn't
【单选题】He attended the party without _______________.
A.
invited
B.
inviting
C.
having invited
D.
being invited
【单选题】He came to the dinner without ______ .
A.
inviting
B.
to invite
C.
invite
D.
being invited
【简答题】计算平面机构自由度的公式为 ,应用此公式时应注意判断: A. 铰链, B. 自由度, C. 约束。
【简答题】.平面机构自由度的计算公式为____。
【简答题】A．He has a better idea. B．He wants to be invited. C．It will depend on the weather. D．He is sure to go for an outing.
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