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问题 多项选择题

下列器官中，参与维持内环境的各种理化因素（体内细胞外液的容量、酸碱度和电解质含量）稳定状态的是（）

A.脾脏

B.肾脏

C.肺脏

D.皮肤

答案

参考答案：B, C, D

单项选择题

属于补充概算定额“地下连续墙成槽——液压抓斗成槽法”采用的施工机械的是（）。

A.液压抓斗

B.卷扬机

C.试压泵

D.电焊机
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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.

（72）是（）

A.length

B.pair

C.size

D.space
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