传感器是一种采集信息的重要器件.如图所示是一种测定压力的电容式传感器,A为固定电

题型:选择题

问题:

传感器是一种采集信息的重要器件.如图所示是一种测定压力的电容式传感器,A为固定电极,B为可动电极,组成一个电容大小可变的电容器.可动电极两端固定,当待测压力施加在可动电极上时,可动电极发生形变,从而改变了电容器的电容.现将此电容式传感器与零刻度在中央的灵敏电流表和电源串联成闭合电路,已知电流从电流表正接线柱流入时指针向右偏转.当待测压力增大时,下列说法中正确的是(   )

A.电容器的电容将增加

B.电容器的电荷量将增加

C.灵敏电流表指针向左偏转

D.灵敏电流表指针向右偏转

考点:电容器的概念和原理
题型:选择题

情景对话

根据对话情景和内容,从对话后所给的选项中选出能填人每一空白处的最佳选项,选项中有两个为多余选项。

Repairman: Good afternoon.     1    

Customer:  Hello. My mobile phone isn't working. Could you repair, please?

Repairman:      2            

Customer: It worked well yesterday, but I simply couldn't turn it on this morning.

Repairman:      3     

Customer: Here you are.

Repairman: Well,I think we,11 be able to fix it. You can pick it up this Friday.

Customer: Oh, no. That's too long.        4       I need it as soon as possible.

Repairman:         5       what time?

Customer: Let me see. How about Wednesday afternoon?

Repairman: After five o'clock

Customer: Ok. Thank you.

A. That's great.

B. I beg your pardon?

C. Let me have a look.

D. What's the problem?

E. Pm sorry to hear that.

F. What can I do for you?

G. I wonder if you could fix it earlier.

题型:选择题

HIV主要攻击何种表面标志的T细胞()

A.Smlg

B.CD3

C.C3b受体

D.C3d受体

E.CD4

题型:选择题

社会:和谐

A.关系:冷淡

B.剥削:反抗

C.反感:同情

D.银行:贷款

题型:选择题

绞接法一般适用于10mm2及以下的小截面导线。()

题型:选择题

以下关于 ADSL 技术的说法,哪个是错误的?

A.ADSL 可以有不同的上下行传输速率

B.ADSL 可以传送数据、视频等信息

C.ADSL 信号可以与语音信号在同一对电话线上传输

D.ADSL 可以为距离 10km 的用户提供 8Mbps 下行信道

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