题目内容

保证船舶海上安全航行的首要作法是（）

A. 保持正规了望
B. 使用安全航速
C. 判明碰撞危险
D. 采取避碰行为

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煤气管道着火（）以下可以直接关闭。

A. 20mm
B. 100mm
C. 40mm
D. 50mm

thought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. case
B. event
C. thing

热利下重者，（）主之。

分析说明中小学CAI课件评价应注意的问题。