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When the weather turns warm, everyone wants to be in or around the water. Learning how to keep safe is necessary if you plan to go swimming. “Buddy up!” Always swim with a partner, every time-and this is very important. Even experienced swimmers can become tired or face sudden accidents, which might make it difficult to get out of the water. When you swim together, you can help each other or go for help in a minute. Get skilled. It’s good to go be fully prepared. Learning some life-saving skills can help you save a life. A number of organizations offer free classes to both beginning and experienced swimmers and boaters. Check with local hospitals, or the Red Cross. Know your limits (极限). Swimming an be a lot of fun and you might want to stay in the water as long as possible. If you’re not a good swimmer or you’re just learning to swim, don’t go in water that’s so deep for you and don’t try to keep up with skilled swimmers. That can be dangerous, especially when your friends are challenging you. If you are a good swimmer and have had lessons, keep an eye on friends who aren’t as comfortable or as skilled as you are. If they or you are getting tired, you should take a break for a while. Swim in safe areas only. It’s a good idea to swim only in places that are directed by a lifeguard. No one can expect changing ocean currents (水流), sudden storms, or other dangers. In the event that something does go wrong, lifeguards trained in life-saving skills are ready to help. Swimming in an open body of water like a lake is different from swimming in a pool. Do your research so you know where not to swim, and pay attention to any warning sign(警告标志) posted in the area. ­                       小题1: on swimming safety Swim with a partner It is very 小题2: to go swimming with partners. Partners who are 小题3: together can help each other or ask for help at once. Make full小题4: Learning some life-saving skills can be very 小题5: during a sudden danger. 小题6: free classes offered by local hospitals, or the Red Cross. Know your limits Do not swim in the water that is too deep. Do not try to swim too小题7: to catch up with skilled swimmers. 小题8: out for your partners if you are an experienced swimmer. Swim in safe areas Swim in places where there is a 小题9: . There is 小题10: between swimming in a pool and in the lake.
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【多选题】每条引入管上均应装设( ),必要时还要有泄水装置。
A.
阀门
B.
水表
C.
压力表
D.
疏水器
【多选题】机车冷却水系统内部要求密封可靠,避免空气和燃气串入,如果串入的话将会造成()。
A.
冷却水流动堵塞
B.
爆炸
C.
系统内产生穴蚀
D.
柴油机不工作
【单选题】下列原因中会引起双燃料发动机产生敲缸或尖锐爆鸣声的是()。①活塞破裂②空气滤器受堵③喷油定时不正确④柴油品质问题
A.
①②
B.
①③
C.
②④
D.
③④
【判断题】进程在运行中可以自行修改自己的进程控制权。
A.
正确
B.
错误
【判断题】柴油机不会产生爆燃。
A.
正确
B.
错误
【单选题】理想和现实的对立性表现在( )。
A.
理想是“应然”的,现实是“实然”的
B.
理想是将发生的现实,现实是过去的理想
C.
理想超越现实,现实决定理想
D.
理想和现实在一定条件下可以相互转化
【单选题】理想和现实的对立性表现在( )
A.
理想是“应然”的,现实是“实然”的
B.
理想是将发生的现实,现实是过去的理想
C.
理想服从于现实,现实决定理想
D.
理想和现实在一定条件下可以相互转化
【单选题】理想和现实的对立性表现在()
A.
理想是“应然”,现实是“实然”
B.
理想就是现实
C.
有了理想,就能变成现实
D.
理想不可能变成现实
【单选题】柴油机速燃期中压力升高率过大产生的不良后果是()。
A.
会使最高爆压不能达到规定值
B.
会使最高爆压产生时刻过迟
C.
会造成燃烧不完全
D.
会导致燃烧敲缸
【判断题】每条引入管上均应装设( ),必要时还要有泄水装置。
A.
正确
B.
错误
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