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【单选题】
The Deadly Life Saver When a family climbs into a vehicle to go on a trip or even a short ride, it's important that everyone is as safe as possible. We know that terrible accidents can occur. That's【1】devices like seat belts and air bags have been invented and put into cars, vans, and【2】. 【3】, devices that are meant to save lives can be a threat to life. The air bag is such a device. Air bags were designed to【4】rapidly in an accident. They were designed to stop an average adult male who didn't bother to fasten his seat belt【5】smashing into or through the front of a car.【6】. they inflate at approximately 200 miles per hour. An air bag is not a soft cushion It delivers a blow that can【7】injure or kill a child or small adult. Air bags can be beneficial, but you must know and account for the dangers. Children should not sit in the front passenger seat of a vehicle that has a passenger side air bag. It's especially【8】to put an infant who must use a rear facing car seat in the front of such a vehicle. Children are always safer in the back seat. The center rear seat is best. And of course, all passengers should use their seat belts. Take your example from race car drivers. They know how to increase their chances of【9】a crash. The day will come when vehicles are equipped with 'smart' air bags that automatically【10】their force to the size and weight of a passenger. But for now, each of us has to be smart about these imperfect 'life savers'. (1)
A.
when
B.
how
C.
why
D.
because
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【判断题】( )埋入混凝土中的非镀锌钢导管外壁需做防腐处理。
A.
正确
B.
错误
【单选题】对数列 ,当 无限增大时,数列 无限地趋向于_________。
A.
0
B.
1
C.
-1
【简答题】甲做180个机器零件与乙做240个机器零件所用的时间相同,已知两人一小时共做70个机器零件,每人每小时各做多少个机器零件?
【单选题】若数列 以常数 为极限,则( )
A.
当 无限增大时, 越来越趋近于常数
B.
当 越来越大时, 越来越趋近于常数
C.
当 无限增大时, 无限地趋近于常数
D.
当 无限增大时, 有限地趋近于常数
【简答题】一个工厂原来造一台机器要用144小时,改进技术后,只用96小时就可以生产一台.原来造6台机器的时间,现在可以造多少台?
【简答题】张师傅做一批机器零件,原计划每天做50个,6天完成.实际每天多做10个.实际每天做的零件占这批零件总数的几分之几?
【简答题】一台内燃机每分钟1200转那么每秒机器做 ____ 次功,完成_____次冲程火花塞工作____次.
【简答题】一台机器的检修工作,甲队单独做2小时完成,乙队单独做需要3小时完成.现在先由乙做1小时,再由甲乙两队合做,则还需几小时完成?
【简答题】一个工厂原来制造一台机器需要144小时,改进技术后,只要96小时就可以生产一台,原来制造50台的时间,现在可以多制造多少台?
【单选题】有关专业和职业的关系,以下说法正确的是:
A.
专业与职业分离
B.
专业与职业交叉
C.
专业为核心,职业包容专业
D.
以上说法都正确
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