初产妇,孕37周,8小时前突然出现阴道流液,如小便样,6小时前开始出现规律宫缩,因胎手脱出于阴道口1小时就诊。查体:产妇烦躁不安,腹痛拒按,脉搏110次/分,呼吸28次/分,胎心160次/分,导尿时见血尿最适宜的处理是()
A. 口服地西泮
B. 消毒后还纳肢体
C. 全麻下行内倒转术
D. 立即行剖宫产
E. 等待宫口开全后行牵引术
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生态系统的概念是()于1953年提出来的。
A. Fisher
B. Tansley
C. Vickerman
D. Mobius
Dual electro-hydraulic steering units usually operate ().
A. with both pumps on line at the same time
B. with one pump on standby
C. with the follow-up gear disconnected
D. only when the rudder is moved amidshi