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根据卫生部等九部委局《关于建立国家基本药物制度的实施意见》 非政府举办的各类医疗机构应当

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力系如图3-3所示。且F1=F2=F3=F4。问力系向点A和B简化的结果是什么?二者是否等效?

已知某挖土机挖土的一个工作循环需2分钟,每循环一次挖土0.51m3,工作班的延续时间为8小时,时间利用系数K=0.85,则该机械的产量定额为()m3/台班。

A. 12.8
B. 15
C. 102
D. 120

在刚体上A,B,C二点分别作用三个力F1,F2,F3.各力的方向如图3-2所示,大小恰好与△ABC的边长成比例。问该力系是否平衡?为什么?

A.He enjoys finding fault with exams. B.He is sure of his success in the exam.

A. He enjoys finding fault with exams.
B. He is sure of his success in the exam.
C. He doesnt know if he can do well in the exam.
D. He used to get straight As in the exams he took.

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