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【多选题】
下列对于主矩的说法正确的是:A.
总能找到一个简化中心，使主矩为零
B.
主矩是否为零，不依赖参考点的选择
C.
主矩是作用在刚体上所有力的力矩的矢量和
D.
力偶的主矩不依赖简化中心的选择
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反馈参考答案：
举一反三
【判断题】george was severely punished for kicking an opponent in an attempt to put him out of action
A.
正确
B.
错误
【单选题】Margaret Spellings, the secretary of education, announced a pilot reform. to the No Child Left Behind Act (NCLB), George Bush’s education law, which was passed in 2002 Up to ten states, she said, woul...
A.
provide tests for pupils on maths and reading from third to eighth grade.
B.
add some science testing in schools for pupils aged from 8 to 13.
C.
enhance teaching standards which schools should be responsible for meeting.
D.
transfer pupils in falling schools to a better one or get them some tutoring.
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