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【单选题】
砖砌体留直槎时应加设拉结筋拉结筋沿墙高每( )设一层A.
300mm
B.
500mm
C.
700mm
D.
1000mm
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】在单相桥式整流电路中,设变压器副边电压有效值为U 2 ,则在负载电阻R L 上获得的输出电压平均值U O(AV) 约等于()。
A.
U 2
B.
0.45U 2
C.
1.2U 2
D.
0.9U 2
【简答题】在不加滤波的单相桥式整流电路中，输出电压平均值U O（AV） =9V，则输入正弦电压的有效值应为（）V。
【简答题】If you think independence means the opportunity to be totally ______, then a relationship means so3．If you think independence means the opportunity to be totally ______, then a relationship means some...
【单选题】What does that sign mean? [ ]
A.
It means you must keep the grass
B.
It means you must keep off the grass
C.
They mean you shouldn't keep off the grass
D.
They mean you should keep the grass
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