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砌筑砂浆中对水泥有什么要求

答案

参考答案:砌筑砂浆中对水泥品种、强度等级虽没有限制,但使用水泥时应注意水泥的品种、性能及适用范围。一般宜选用普通硅酸盐水泥或矿渣硅酸盐水泥,不宜先用强度等级太高的水泥。水泥的选择可参考五大水泥品种选用表(见表3-9)。

表3-9 五大水泥品种选用表
填空题
根据对话内容,从下面方框中选择适当的单词或词组填空,使对话内容完整正确。
 Internet,  became homeless,  What was worse,  hear about,  am sorry to
 
A: Did you     小题1:   the terrible natural disaster in Japan last month?
B: Yes. My online friend told me about it on March12th—the day after the disaster.
A: I was shocked by the news when I searched the     小题2:   that afternoon. A lot of people lost their lives and many more    小题3:    after the earthquake.
B:    小题4:  , a tsunami came after the earthquake.
A: Many buildings were washed away by the sea water.
B: My friend lost his daughter in the disaster. He was so sad about that. I     小题5:  hear that. What do you think we can do to help people in Japan?
A: Let’s ask more people to donate some food, clothes or money to them.
B: OK. Let’s go.
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问答题 论述题

简述可变容积式压力调节器工作过程。

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