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【单选题】
汽油中有少量烯烃杂质,在实验室中使用最简便的提纯方法是A.
催化加氢
B.
入浓H2S04洗涤,再使其分离
C.
加入HBr使烯烃与其反应
D.
入水洗涤,再分离
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皮皮学刷刷变学霸
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【简答题】服务人员上身姿势一般应注意()方面。A. A:头部端正 ; B. B:身体直立 ; C. C:手臂的摆放 ; D. D:入座的秩序;
【单选题】I play the piano when I was a young boy.
A.
wasn’t used to
B.
wasn’t use to
C.
didn’t used to
D.
didn’t use to
【单选题】Why didn't the boy tell his grandmother the truth at first?
A.
Because he didn't want his grafidmothar to be sad.
B.
Because he didn't want to go home without hearing a story.
C.
Because his grandmother would be very angry.
D.
Because his grandmother would tell his mom what he had done.
【单选题】患者，女，32岁。39+6周妊娠，规律宫缩10小时。阴道检查示：胎膜已破，羊水清，S一1，宫口开大4cm。4小时后阴道检查宫口无进展。 此时应考虑为( )
A.
潜伏期延长
B.
活跃期延长
C.
活跃期停滞
D.
第二产程延长
E.
滞产
【简答题】女,32 岁。39+6 周妊娠,规律宫缩10 小时。阴道检查示:胎膜已破,羊水清,S=-1,宫口开大6cm。4 小时后阴道检查宫口无进展。
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