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问题 单项选择题

改善混凝土拌合物流变性能的外加剂不包括（）。

A．减水剂

B．引气剂

C．泵送剂

D．膨胀剂

答案

参考答案：D

解析：

改善混凝土拌合物流变性能的外加剂，包括减水剂、引气剂和泵送剂等。

单项选择题 A型题

面色白而虚浮者，属（）

A.血虚证

B.失血证

C.实寒证

D.阳虚水泛证

E.阳气暴脱证
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单项选择题

A glue that holds the whole Internet together is the network layer protocol, (71) .Unlike most older network layer protocols, it was designed from the beginning with internetworking in mind. Its job is to provide a (72) way to transport data grams from source to destination, without regard to whether these machines are on the same network or whether there are other networks in between them.

Communication in the Internet works as follows. The (73) layer takes data streams and breaks them up into data grams. Each datagram is transmitted through the Internet, possibly being fragmented into smaller units as it goes. When all the pieces finally get to the destination machine, they are reassembled by the (74) layer into the original datagram. This datagram is then handed to the transport layer, which inserts it into the receiving process’ input stream.

An IP datagram consists of a header part and a text part. The header has a (75) part and a variable length optional part.

74（）

A．data link

B．transport

C．network

D．application
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