下列描述错误的是( )。A.闭环控制系统的精度通常比开环控制系统的精度高 B.开环

题型:单项选择题

问题:

下列描述错误的是( )。

A.闭环控制系统的精度通常比开环控制系统的精度高

B.开环控制不存在稳定性的问题

C.闭环控制系统总是稳定的

D.反馈可能引起系统的振荡

考点:注册公用设备工程师暖通空调与动力专业基础勘察设计注册公用设备工程师暖通空调与动力专业基础
题型:单项选择题
Do you like pop music? Most people  1__. One of the best bands on the music scene  2__ the New Ocean Waves. In the last twelve months, they’ve  3__ three major concerts and made a hit CD. They’re going to  4__ on CCTV next month. And then they’re going to go on a world tour in which they will perform in ten  5__ cities. Be sure not to  6___ them if they come to a city near you – if you can get tickets, that is.
7___ years, we played other people’s songs”, says lead singer Zhu Wen. “ But now we play  8___ our own songs. We’ve had _9_  _ songs in the top ten, but we really hope to have a number one hit some day.” Good luck to the New Ocean Waves. They’re 10___ to a great start. And they’re really nice people. Did you know that they gave half of the money they made to a charity for homeless children?
小题1:
A.doesB.do C.didD.done
小题2:
A.is B.was C.has D.had
小题3:
A.hasB.was C.had D.were
小题4:
A.comeB.go C.appear D.find
小题5:
A.the sameB.same C.difficult D.different
小题6:
A.miss B.catch C.holdD.lose
小题7:
A.With B.For C.In D.At
小题8:A. most    B. less    C. mostly      D. little
小题9:
A.a little B.a few C.little D.few
小题10:
A.in B.offC.ofD.without
题型:单项选择题

烧伤病人留置导尿管的必要性包括()

A.作为观察有无休克的重要临床指标

B.根据尿量多少随时调整输液的速度与成分

C.观察血红蛋白尿的转归过程

D.便于留取尿标本化验

E.便于会阴部创面处理

题型:单项选择题

急性硬膜外血肿最常见的合并损伤是

A.脑内血肿

B.脑挫伤

C.枕骨大孔疝

D.脑积水

E.颅骨骨折

题型:单项选择题

船舶港务费的免征对象有哪些?这些免征对象在什么情况下应缴纳船舶港务费?

题型:单项选择题

输液引起空气栓塞,致死原因是栓子阻塞:

A.肺动脉入口

B.肺静脉入口

C.主动脉入口

D.上腔静脉入口

E.下腔静脉入口

更多题库