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问题 单项选择题

病人用力加腹压时，子宫颈及部分子宫体脱出 * * 外口，诊断为：

A．子宫脱垂Ⅱ度轻

B．子宫脱垂Ⅱ度重

C．子宫脱垂Ⅱ度轻合并膀胱膨出

D．子宫脱垂Ⅲ度

E．以上都不是

答案

参考答案：B

单项选择题

近年来采用有限单元法，根据比较符合实际情况的弹塑性应力应变关系，分析土坡的变形和稳定，一般称为（）。

A.极限分析法

B.Bishop法

C.极限平衡法
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单项选择题

A glue that holds the whole Internet together is the network layer protocol, ___35___. Unlike most older network layer protocols, it was designed from the beginning with internet working in mind. Its job is to provide a-___36___ way to transport datagrams 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 ___37___.layer takes data streams and breaks them up into datagrams. 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 ___38___ 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 ___39___ part and a variable length optional part.

39（）

A. 40-byte fixed

B. 64-byte fixed

C. 20-64 bytes variable

D. 20-byte fixed
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