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问题 单项选择题

顿咳常见于（）

A.青年

B.老年

C.小儿

D.女性

E.男性

答案

参考答案：C

解析：顿咳短促，呈阵发性、痉挛性，连续不断，咳后有鸡鸣样回音，又称为百日咳。多因风邪与痰热搏结所致，常见于小儿（七版教材P92）。故答案为C。

单项选择题

儿童肾痛综合征最常见的病理类型是

A．微小病变肾病
B．系膜增生性肾炎
C．膜性肾病
D．局灶性节段性肾小球硬化
E．系膜毛细血管性肾炎
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单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.

(66) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.

(67) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.

(68) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.

(69) is a device used to connect two separate network that use different communication protocol.

(70) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

69（）

A．Router

B．Gateway

C．Bridge

D．Hub
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