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问题 单项选择题 A1/A2型题

由一条肽链组成且具有7个跨膜α-螺旋的膜蛋白是（）

A.G-蛋白

B.腺苷酸环化酶

C.配体门控通道

D.酪氨酸激酶受体

E.G-蛋白偶联受体

答案

参考答案：E

单项选择题

粘膜及皮肤皱褶部位水疱、糜烂、疣状增生、脓痂。属于天疱疮哪一类型：

A．外感风热之毒，阻于肺胃二经，蕴蒸皮肤而发
B．情志内伤，肝气郁结，久而化火，肝经火毒，外溢皮肤而发
C．寒湿困脾，脾失健运，肌肤失养而发
D．肝胆湿热，蕴结肌肤而发
E．禀赋不耐，风、湿、热毒郁于肌肤而发
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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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