液氧面过高,氧气纯度会(),液氧面过低,会造成(),氧纯度()。
参考答案:下降;工况不稳;上升
-What about finding out ______ Alice is going to Wuxi?
-I'm afraid her friends have told her Wuxi has many places of great interest.[ ]
A. where
B. that
C. why
D. how
心脏病患者做非心脏手术,其耐受力最差的心脏病是()
A.非发绀型先心病
B.高血压心脏病
C.风湿性心脏病
D.急性心肌炎
E.冠状动脉硬化性心脏病