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问题 解答题

如果两面旗，表示一种信号，现在有红、黄、蓝色旗各一面，最多能表示出多少种不同的信号？

答案

因为两面旗表示一种信号，即红+黄，红+蓝，黄+蓝，共3种．

答：最多能表示出3种不同的信号．

选择题

They _____ on the program for almost one week before I joined them, and now we _____ it as no good results have come out.

A．had been working; are still working

B．had worked; were still working

C．have been working; have worked

D．have worked; are still working
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多项选择题

税收优惠的形式包括有（），这些都对税收筹划具有诱导作用。

A.税额减免

B.税基扣除

C.税率降低

D.加速折旧
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