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【判断题】
坝基设有防渗帷幕和排水幕的实体重力坝，可以减少坝基面上的浮托力。A.
正确
B.
错误
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A.
60-meter
B.
80-meter
C.
90-meter
D.
100-meter
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A.
Y 轴坐标值
B.
极角为顺时针 60°
C.
极角为逆时针 60°
D.
极径
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A.
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B.
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3 hops
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