工人上厕所所需要的时间是()。
A.非定额时间
B.定额时间
C.基本时间
D.工人造成的损失时间
参考答案:B
The eighteenth and nineteenth centuries _____ the widespread use of electricity and the birth of the steam engine , leading to the development of factories and cities.
A.watched
B.observed
C.saw
D.showed
羊水进入母体血液循环,引起肺动脉高压,首选治疗药物是()
A.地塞米松
B.阿托品
C.氨茶碱
D.罂粟碱
E.呋塞米