题目:
Two pulleys are connected by a belt as shown in the drawing above. If pulley Q makes 300 evolutions per minute, how many revolutions per minute does pulley P make ?()
(1)The length of the belt is 12π.
(2)The ratio of the radius of pulley P to the radius of pulley Q is 2 to 1.
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
答案:
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参考答案:B, C, D