单项选择题
A.负荷要大 B.内容要多样化 C.内容合理、各点负荷适当 D.各点不断循环 E.各点负荷量一样
A.200M B.300M C.400M D.500M E.600M
A.10~20M B.30~60M C.80~100M D.100~150M E.150~200M
A.10sB.20sC.30sD.40sE.50s
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