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单选题
It was just at the moment______ he worked out the problem that he had long been puzzled about.
A
since
B
which
C
because
D
that
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RA：RB＝1：4；vA：vB＝2：1
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单选题Which of the following would a teacher encourage students to do in order to develop their cognitive strategies?A
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单选题A
B所受摩擦力始终不可能为零，摩擦力方向时而沿斜面向上时而沿斜面向下B
B所受摩擦力有时有可能为零C
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