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【多选题】
关于无棉纤维水泥平板,下列说法正确的是( )。A.
中密度平板的密度要求1.1＜D≤1.4；
B.
燃烧性能等级为1级；
C.
经过30次冻融循环，不得出现破裂、分层
D.
低密度板的含水率≤12%
E.
高密度板的吸水率≤28%
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举一反三
【单选题】The three college students did what they could _____ the two children, although they was in danger.
A.
rescue
B.
rescued
C.
to rescue
D.
rescuing
【简答题】“宋体”是非衬线字。
【简答题】Speaking: How often do you go shopping? Where do you do the daily shopping?
【简答题】How often do you go shopping? Where do you do the daily shopping?
【简答题】What did the two astronauts think the trip would be like? ______.
【简答题】滚珠丝杠副中滚珠的循环方式分为哪几类?试比较其结构特点。
【单选题】How often do you do sports?
A.
Good idea!
B.
Maybe less than once a month.
C.
Well, the doctor said I needed to change my unhealthy life.
D.
First, I suggest you find out which aspects need changing.