题目内容

电泵变压器由几部分组成？

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carrying down回答下面的题目：Traffic in Uur CitiesTile volume of traffic in many cities in the world today continuesto expand．This causes many problems，including serious air pollution，lengthydelays，and the greater risk (51)accidents．Clearly，something must be done，but it is often difficult to persuade people to (52)theirhabits and leave their cars at home．One possible (53)is to make it more expensive for peopleto use their cars by (54)charges for parking and (55)tougherfines for anyone who (56)the law．In addition，drivers could be required to pay for using particular routes atdifferent times of the day．This system， (57)as“road pricin9”，is alreadybeing introduced in a (58)of cities，using aspecial electronic card (59)to the windscreen of the car．Another way of (60)with the problem is to provide cheapparking on the (61)of the city，and strictly control the number ofvehicles allowed into the centre．Drivers and their passengersthen use a special bus (62)for the final stage of their journey,Ofcourse．the most important (63)is to providegood public transport．However，toget people to (64)the comfort of their cars，publictransport must be felt to be reliable，convenient andcomfortable，with fares__ (65)at an acceptablelevel．

A. putting off
B. bringing in
C. taking away

静息电位由正常的-90mV改变为-95mV时，其兴奋性（）

A. 升高
B. 降低
C. 先升高后降低
D. 先降低后升高

在风包出口管路上必须加装（）。

A. 释压阀
B. 压力阀
C. 安全阀
D. 流量阀

信号设备防寒过冬检查中有哪些重点内容？