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一水牛怀孕期已满，分娩开始后胎水流失，不断努责3h不见胎儿产出，检查母体能站立，体温36.5℃，心跳115次/min，胎儿背部，头和左前肢进入产道，右前肢自身胸腹下，刺激胎儿尚有活动导致的难产原因是（ ）A、产力不足 B、产道狭窄 C、胎位异常 D、胎儿姿势异常 E、胎向异常 为及时、合理、有效的助产，应首选的助产方法是（ ）A、剖腹取胎术 B、药物催产 C、截胎术 D、牵引术 E、矫正术
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【简答题】电液动换向阀是由( )和液动换向阀组成的复合阀。
【单选题】Soapy in "The Cop and the Anthem" was a tramp in New York who spent the night in Central Park.But he realized it was time to make arrangements for winter by ___________ for three months.
A.
working as a driver
B.
moving to Florida
C.
breaking law
D.
doing nothing
【单选题】Economists normally
A.
do not try to explain people's tastes, but they do try to explain what happens when tastes change.
B.
believe that they must be able to explain people's tastes in order to explain what happens when tastes change.
C.
do not believe that people's tastes determine demand, so they ignore the subject of tastes.
D.
incorporate tastes into economic models only to the extent that tastes determine whether pairs of goods are substitutes or complements.
【单选题】Economists normally assume that the goal of a firm is to
A.
maximize its total revenue.
B.
maximize its profit.
C.
minimize its explicit costs.
D.
minimize its total cost.
【简答题】电液换向阀是由()和()组成的复合阀
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