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【单选题】
某场地土从上至下地层情况:第一层粉土,厚3m,重度r=18kN/m3;第二层粘土,厚4m,重度r=19kN/m3,试求地表下5m深处的竖向自重应力( )。A.
83kPa
B.
92kPa
C.
106kPa
D.
118kPa
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【单选题】Beijing is one of the biggest _______ in the world.
A.
citys
B.
city
C.
cityes
D.
cities
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A.
True
B.
False
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A.
回零
B.
空运转
C.
置零
D.
停止
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A.
正确
B.
错误
【单选题】在 Z 轴方向对刀时,一般采用在端面车一刀,然后保持刀具 Z 轴坐标不动,按( )按钮。 即将刀具的位置确认为编程坐标系零点。
A.
）回零
B.
）置零
C.
）空运转
D.
）主轴停止
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