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【简答题】

What are you going to do if you are in a burning house? How will you escape? Do you know how to save yourself? Please read the following passage. Escaping a fire is a serious matter. Knowing what to do during a fire can save you life. It is important to know the ways you can use and show them to everyone in the family, such as stairways and fire escapes, but not lifts.   From the lower floors of the buildings, escaping through windows is possible, learn the best way of leaving by windows with the least chance of serious injury.   The second floor window is usually not very high from the ground. An average person, hanging by the finger-tips will have a drop of about six feet to the ground. It is about the height of an average man. Of course, it is safer to jump a short way than to stay in a burning building.   Windows are also useful when you are waiting for help. Be sure to keep the door closed. Or smoke and fire may be drawn into the room. Keep your head low at the window to be sure you get fresh air rather than smoke that may leaked(渗) into the room.   On a second or third floor, the best windows for escape are those that open onto a roof. From the roof a person can drop to the ground more safely. Dropping onto cement(水泥) might end in injury. Bushes(灌木丛) and grass can help to break a fall. 小题1:It is important to _______. A.put out the fire in the burning house B.know the ways to escape the fire C.jump off a burning house D.keep the door closed 小题2:It is possible to escape through the windows _______. A.if there are some bushes on the ground B.if you are strong enough C.if you live on a lower floor D.If you have a long rope 小题3:Which of the following escaping way is NOT right? _______. A.You can escape though stairways. B.You can choose fire escapes. C.Escape from the windows that open onto a roof. D.Use a lift to come down at once. 小题4:Open the window so that _______ if the building is on fire. A.you can get fresh air B.you can call for help C.you can easily jump off D.you can be seen first 小题5:The best title of the passage is _______. A.Escaping from the Windows B.Save Yourself in the Burning House C.Knowledge on Fire D.Waiting for Help

题目标签:水泥
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参考解析:
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【多选题】水泥的凝结和硬化与( ) 有 关

A.
水泥的体积和重量
B.
硬化时间
C.
拌和水量
D.
水泥的细度
E.
石膏掺量

【单选题】水泥的颗粒越细,( )。

A.
早期强度越低
B.
水化速度越快
C.
粉磨时能耗小、成本越低
D.
硬化收缩越小

【单选题】水泥的生产工艺简单概括为( )

A.
一磨一烧
B.
两磨一烧
C.
两磨两烧
D.
三磨一烧

【单选题】水泥的细度对水泥的影响包括( )。

A.
水泥的强度和耐腐性
B.
水泥水化的速度和水泥的抗侵蚀性
C.
水泥的凝结时间和水泥的等级
D.
水泥的凝结时间、强度、需水量和安定性

【多选题】水利工程常用的水泥为()。

A.
大坝水泥
B.
抗硫酸盐硅酸盐水泥
C.
耐酸水泥
D.
防潮硅酸盐水泥
E.
普通矿渣水泥