胎头吸引术产妇的最佳体位是（）。
A.俯卧位
B.膀胱截石位
C.半坐位
D.侧卧位
E.仰卧位
参考答案：B
It was decades ago ________ I was in my teens ________ the Chinese government decided to reform the social economic system.
A．when; when
B．that; which
C．when; that
D．before; that
对乙酰氨基酚中对氨基酚的限量为（）.
A．1.2%
B．0.005%
C．0.06%
D．0.02%
E．0.1%
