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%