妇女月经后期而来，量少，色紫暗，夹有血块者，多属
A．气血亏虚
B．肝气郁滞
C．血热内迫
D．寒凝血滞
E．气不摄血
参考答案：D
在做“探究单摆周期与摆长的关系”的实验时，摆球的密度应选得________些（填“大”或“小”），如果已知摆球直径为2.00cm，让刻度尺的零点对准摆线的悬点，摆线竖直下垂，如图所示，那么单摆摆长是________m．如果测定了40次全振动的时间如图中秒表所示，那么秒表读数是________s，单摆的摆动周期是________s．
The manager requested that the task _____ by five o'clock without delay.[ ]
A. must be finished
B. would be finsihed
C. was finished
D. be finished
