He broke his contract with the ________.
A. firms
B. firm
C. firming
D. firmed
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His wife and children moved to______ him in their new home...
A. be joined
B. join
C. joining
D. will join
Make sure you___________ the queue inside the bank.
A. join
B. to join
C. be joined
D. joining
如果两个同维的向量组等价, 则这两个向量组()
A. 相等
B. 所含向量的个数相等
C. 不相等
D. 秩相等
根据三力平衡汇交定理，下面说法正确的是（）。
A. 共面不平行的三个力互相平衡必汇交于一点
B. 共面三力若平衡，必汇交于一点
C. 三力汇交于一点，则这三个力必互相平衡
D. 共面三力中若两力汇交于一点，则第三个力必通过这一点
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