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问题 单项选择题

国务院 * * 通过召集和主持国务院全体会议和（）又称两会制，讨论国务院工作中的重大问题。

A.人民代表大会

B.政治协商会议

C.人大常委会

D.国务院常务会议

答案

参考答案：D

多项选择题

下面的（）不能用来控制各气缸的进排气开闭时刻。

A.推杆

B.曲轴

C.凸轮轴

D.摇臂轴
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单项选择题

In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private key can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secret key.

A．more

B．necessary

C．need

D．space
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