不定项选择

诺丁斯关怀理论中强调教师的作用不在于监督学生遵守规则,关键在于以身作则。()

A．正确
B．错误

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单项选择题

6. A thin copper rod 1.00 m long has a mass of 50.0 g. What is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.100 T?

A．1.20 A
B．2.40 A
C．4.90 A
D．9.80 A
E．none of those answers

单项选择题

设X的分布律为
则E( 3X+5) =（）.
A、- 0.2
B、0
C、0.2
D、4.4