He was extremely ______at the _______new

患者女，30岁。月经频发，经血量正常，因婚后4年未孕就诊。妇科检查：子宫正常大小，双附件无异常，基础体温呈双相型。最可能的诊断是

A．无排卵性功血

B．排卵期出血

C．黄体功能不全

D．子宫内膜脱落不全

E．子宫内膜炎

防抱死制动系统有什么作用？

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.
Open Shortest Path First(OSPF) is a (66) routing algorithm that (67) work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (68) processing power. The Dijkstra algorithm is used to calculate (69) OSPF routing table updates only take place when necessary, (70) at regular intervals.

A．distance-vector

B．link-state

C．flow-based

D．selective flooding

供给学派主张减税应（）

A.削减平均税率以增加低收入阶层的消费需求

B.削减边际税率以增加高收入阶层储蓄和投资的供给

C.根据不同经济风向使用

D.大规模、持久

电动机在维护保养时，应拆下电动机前端盖，用（）或清洗剂清洗定子和转子处的油污。·

A.汽油

B.四氯化碳液

C.柴油

D.热水