问题
单项选择题
安全阀与爆破片装置并联组合时，爆破片的标定爆破压力不得超过容器的设计压力。安全阀的开启压力应( )爆破片的标定爆破压力。
A．略高于
B．近似于
C．略低于
D．远高于
答案
参考答案：C
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安全阀与爆破片装置并联组合时，爆破片的标定爆破压力不得超过容器的设计压力。安全阀的开启压力应( )爆破片的标定爆破压力。
A．略高于
B．近似于
C．略低于
D．远高于
参考答案：C
Traffic rules help to keep order on the road. They also help to keep people 1 . The pedestrian(行人) has as many rules to 2 as the driver of a car. You should walk on the sidewalk(人行道) or at the side of the road. Always look 3 before you walk across the street. If you like riding a bike, don’t ride in the middle of the road or run 4 red traffic lights. When you ride a bike with a friend, don’t look around or talk. If you drive a car, you should 5 at the traffic lights. You must always 6 a seat belt(安全带). Without belts 7 the driver and the passengers may be badly hurt in a sudden accident. You may not need to take a bus, but 8 if you have to travel in one. Get on or get off a bus only when it comes to a 9 . When it is full, don’t try to get inside 10 you may fall off. Traffic rules are also called Road Safety rules. The maxim(格言) for all road users is “Thinking about others”.
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