题目内容

The memo is to remind you that the meeting you set with Mr. Green has been ___to next Monday.A put away B put off C put down D put up

A. put away
B. put off
C. put down
D. put up

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向量x与向量y的内积是一个实数。()

A. 对
B. 错

向量内积满足=。()

A. 对
B. 错

向量内积是一个非负数,即≥0。()

A. 对
B. 错

如果=0,则向量x与向量y是正交的。()

A. 对
B. 错

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