变电所中直流动力负荷主要是( )。 A.控制负荷 B.发电厂中,直流润滑油泵电动机

题型:单项选择题

问题:

变电所中直流动力负荷主要是( )。

A.控制负荷
B.发电厂中,直流润滑油泵电动机、氢密封油泵电动机
C.电磁操作的断路器合闸机构、交流不停电电源装置、远动、通信装置电源和直流照明等大功率的负荷
D.电磁操动机构和直流照明电源

考点:注册电气工程师供配电专业注册电气工程师(供配电专业)
题型:单项选择题

患者,3天来下后牙遇冷水痛,吐出后痛持续10秒,平时无明显不适。该患者最可能的牙病是()

A.慢性牙髓炎

B.楔状缺损

C.可复性牙髓炎

D.急性牙髓炎

E.邻面中龋

题型:单项选择题

根据短文内容和首字母提示,补全文中单词。

     Children's school is changing very fast today. In the past, teachers 1. k______ children sitting still

for hours. They made them memorize 2. d______ kinds of things. In other 3. w______, the children had

to go on repeating things until they knew them"by heart". Today, many teachers want to know if it is 

4. p______ to make children learn at all. They say you can often help them learn. They say you must let

children and find out things for 5. t_____.

      But for these children, school is a kind of prison. They are there only because their 6. p_____ make

them go. They get out of the classroom as soon as the teacher lets them 7.  l______. Many of them want

to find work, but the law will not let them work 8. u______ they reach a certain 9. a______. And so, they

have to stay in school. Often they do not learn anything at all and 10. h______ every moment.

1.______ 2.______ 3.______ 4.______ 5.______

6.______ 7.______ 8.______ 9.______ 10.______

题型:单项选择题

肠道杆菌的O抗原存在于()。

A.鞭毛

B.荚膜

C.菌毛

D.脂多糖

E.芽胞

题型:单项选择题

可抑制Th0细胞向Th2细胞转化的是 ()

A.IL-5

B.IL-4

C.IFN-γ

D.TNF-α

E.IL-8

题型:单项选择题

理想的医疗保健体系意味着

A.所有患者都可以自由选择医院和医生

B.大医院的规模与科室设置能够满足全体民众的卫生需求

C.基层医疗提供首诊服务,基层医疗与大医院各司其职

D.医院向任何就医者开放,所有的患者都能在水平高的大医院就诊

E.政府负责向公众提供高福利的医疗保健服务

更多题库