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【单选题】
According to the passage, stress we experience in life results from______.A.
the way we think
B.
the situations we are in
C.
the mental problems we suffer from
D.
the way we understand our situations
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【单选题】边长为a的立方框架上，沿对角线AB作用一力，其大小为P;沿CD边作用另一力，其大小为1.732P/3，此力系向O点简化的主矩大小为()。
A.
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B.
1.732Pa
C.
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D.
1.732Pa/3
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