下列关于利尿药的降压机制正确的是（） A.降低血管平滑肌对缩血管物质的敏感性 B.利

非金融企业以货币资金投资收取固定利润的行为，应按照“金融保险业”税目征收营业税。 ( )

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

什么食物能够美白？

下列市场经济组织中，应对自身债务承担无限责任的是( )。

A．个体工商户

B．股份有限公司

C．个人独资企业

D．国有独资公司

E．合伙制企业

无线灯显调车装置故障时，应如何进行调车作业？