搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1/A2型题

初产妇胎头衔接多在（）。

A.预产期前2～3周

B.临产前2～3天

C.临产后24小时

D.破膜后

E.第一产程末

答案

参考答案：A

解析：初产妇多在预产期前2～3周胎头衔接，经产妇多在临产后才衔接。

单项选择题

A management domain typically contains a large amount of management information. Each individual item of（1）information is an instance of a managed object type. The definition of arelated set of managed （2）types is contained in a Management Information Base(MIB) module. Many such MIB modules are defined. For each managed object type it describes, a MIB（3）defines not only the semantics and syntax of that managed object type, but also the method ofidentifying an individual instance so that multiple （4） of the same managed object type can bedistinguished. Typically, there are instances of each managed object（5） within a managementdomain.

（3）是（）

A.connection

B.window

C.module

D.destination
查看答案
多项选择题

当风电机组作为负载时，四象限变流器工作在（）个象限。

A.第一

B.第二

C.第三

D.第四
查看答案