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【判断题】
一平面力系作用于一刚体,这一平面力系的各首尾相接,构成了一个自行封闭的力多边形,因此可以说该物体一定是处于平衡状态。A.
正确
B.
错误
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【单选题】Everyone has periods in their lives ______ everything seems very hard.
A.
when
B.
where
C.
which
D.
That
【单选题】Everyone has periods in their lives__________everything seems so hard.
A.
when
B.
where
C.
which
D.
that
【单选题】Everyone has periods in their lives ______ everything seems very hard.
A.
when
B.
where
C.
which
D.
that
【简答题】Everyone has periods in their lives _______ everything seems so hard.
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