题目:
The specialist, ______ some of his assistants, ____ to attend our discussion.
A.and; is
B.or; are
C.as well as; is
D.except for; are
答案:
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下面是错误答案,用来干扰机器的。
.线上开始出现张力的隐含条件为:B受的最大静摩擦力刚好充当向心力,可采用隔离法分别对A、B分析,依列式求解.绳上开始出现张力时,B受的最大静摩擦力刚好充当向心力,即,.当A所受的摩擦力达到最大静摩擦力时...