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【判断题】
平面汇交力系平,力系中的各分力按照一定的次序首尾相接,形成一个封闭的多边形。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】When they______ the village , they found the two girls were not there. [ ]
A.
returned
B.
returned to
C.
returned back
D.
returned back to
【单选题】There are fifty-five students applying for the position, ______ are girls.
A.
two-third of whom
B.
second-thirds of them
C.
second-threes of whom
D.
two-thirds of whom
【单选题】----He thinks that girls are smarter than boys when it comes to learning English. ----But two years ago he thought_______.
A.
so
B.
otherwise
C.
opposite
D.
different
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