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【简答题】
母猪，3.5岁，体格偏瘦，怀孕114天时分娩，产出8个胎儿后努责微弱，40分钟后仍不见胎儿产出。B超检查可见子宫后部有多头活胎。该猪难产最可能的原因是( )A、继发性子宫弛缓
B、原发性子宫弛缓
C、子宫痉挛
D、胎儿过大
E、阴道狭窄
首选的助产药是( )A、前列腺素
B、雌激素
C、催产素
D、麦角新碱
E、葡萄酸钙
首选的助产手术方法是( )A、牵引术
B、矫正术
C、截胎术
D、剖腹产术
E、子宫颈扩张
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The idea of test-tube babies may make you starry-eyed with delight at the wonders of modern medicine or bleary-eyed with considering the moral/legal implications of starting life in a laboratory. But ...
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A problem is examined and possible reasons and solutions are given.
B.
A procedure is explained and its importance is emphasized.
C.
Two contrasting views of a problem are presented.
D.
Recent scientific advancements are outlined in order of importanc