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【单选题】
下列关于防水砂浆防水层施工的说法中，正确的是（）。
A.
砂浆防水工程是利用一定配合比的水泥浆和水泥砂浆（称防水砂浆）分层分次施工，相互交替抹压密实的封闭防水整体
B.
防水砂浆防水层的背水面基层的防水层采用五层做法，迎水面基层的防水层采用四层做法
C.
防水层每层应连续施工，素灰层与砂浆层可不在同一天施工完毕
D.
揉浆是使水泥砂浆素灰相互渗透结合牢固，既保护素灰层又起到防水作用，当揉浆难时，允许加水稀释
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B.
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C.
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【简答题】提高切削速度、增大进给量和背吃刀量,都能提高金属切除率,其中影响耐用度最大的是 ;影响最小的是 。
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A.
The violin has been modified to fit its evolving musical functions.
B.
The violin is probably the best known and most widely distributed musical instrument in the world.
C.
The violin had reached the height of its popularity by the middle of the eighteenth century.
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