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在炉渣垫层施工中，水泥石灰炉渣垫层的炉渣，使用前应用石灰浆或熟石灰浇水拌和闷透，闷透时间不得少于( )d。

A.3
B.2
C.5
D.4
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单项选择题
根据下面资料，回答21-35题
In the past, I always thought that being a teacher was an easy job. But I changed my（21）when I became a part-time teacher. About four years ago, Richard asked me（22）I could help teach his students how to make a website about themselves.
I（23）because computer is what I do well and I didn′ t think teaching computer would bethat（24）.
But when 1 taught Richard′ s class, some of the students（25）with their friends while I was explaining how to do something. At first I just got angry with them,（26）Richard taught me to think why they were doing this. He said that if he was（27）a lesson and the students were not lis-tening, then he was angry with（28）for not making the lesson clear or interesting for them. I told him that I didn′ t（29）his idea. He then asked me if l had ever（30）the same thing. That made me stop. Of course I had !
If any of my past teachers are（31）this, I want to say sorry if I sometimes played around in the class（32）you were teaching. I didn′ t think how that would make you feel. I promise I will do my best to be a good（33）in the future. Please help us when we don′t understand and most（34）, don′ t be quick to be angry when we fail.（35）of us are perfect but with your help we can be successful.
第（28）题选
A.itself
B.me
C.them
D.himself
单项选择题
下列对配变电所的设置要求中，( )是错误的。
A.-类高层、低层主体建筑内，严禁设置装有可燃性油的设备
B.高层建筑中配变电所宜划为单独的防火分区
C.高、低压配电设备不可设在同一房间内
D.值班室应单独设置，但可与控制室或低压配电室合并兼用
单项选择题
广义相对论的时空观是_________。
A．绝对时间，绝对空间
B．弯曲时间，绝对空间
C．弯曲时间，弯曲空间
D．绝对时间，弯曲空间
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