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【单选题】
关于临产后宫缩特点下列说法中不正确的是A.
宫缩时，宫体部肌纤维变短变宽，收缩后肌纤维松弛，但不能完全恢复原来的长度
B.
宫缩以宫底部最强、最持久，宫底部收缩力几乎是子宫下段的2倍
C.
宫缩起自宫角，均匀协调中线集中，左右对称，再以2cm／s速度向子宫下段扩散
D.
当开全后，宫缩持续约30秒，间歇5～6分钟
E.
宫缩开始后，宫腔内压力于临产初期升高至25～30mmHg，第一产可增至40～60mmHg，于第二产程期间可达100～150mmHg
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【单选题】根据柴油机的基本工作原理,下列哪一种定义最准确:
A.
柴油机是一种往复式内燃机
B.
柴油机是一种在气缸中进行二次能量转换的内燃机
C.
柴油机是一种压缩发火的往复式内燃机
D.
柴油机是和种压缩发火的回转式内燃机
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