下列易导致产后尿潴留的原因是()。
A.产后活动减少
B.产后腹压降低
C.产后会阴部疼痛
D.产褥感染
E.产后出血
参考答案:C
(2013·高考天津卷)If he had spent more time practising speaking English before,he________ able to speak it much better now.
A.will be
B.would be
C.has been
D.would have been
高空焊割作业应选哪种安全带()
A、尼龙
B、帆布
C、标准的防火安全带