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【多选题】
慢性肺心病的发病机制中，引起肺动脉高压的因素有A.
缺氧
B.
高碳酸血症
C.
血液黏稠度增加
D.
COPD反复发作
E.
血容量减少
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皮皮学刷刷变学霸
举一反三
【单选题】Heat does not travel by convection (对流) in solid, because the solid does not move, ______.
A.
so does a liquid
B.
so a liquid does
C.
as does a liquid
D.
so is a liquid
【单选题】Convection( 对流 ) is a ______ simpler physical process than conduction.
A.
more
B.
many
C.
farther
D.
far
【判断题】对流项，表示动量随管长的变化，即系统从一组流动参数改变为另一组参数时动量的改变量。The convection term represents the change of momentum with the length of the pipe, that is, the change of momentum when the system changes from one set of flow...
A.
正确
B.
错误
【单选题】Heat does not travel by convection( 对流 ) in solid, because the solid does not move,____.
A.
as does a liquid
B.
so a liquid does
C.
so does a liquid
D.
so is a liquid
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