燃气调试时,烟气含氧量要求在()之间。
A、1%~4%
B、3%~5%
C、2%~4%
D、4%~8%
参考答案:C
急性心肌梗死溶栓治疗的依据是()
A.多数急性心肌梗死尸检证实为冠状动脉栓塞
B.多伴有斑块破裂
C.斑块严重狭窄
D.多伴有斑块内出血
E.闭塞性的血栓形成
---Mum, it is nice weather. I want to skate this afternoon.
---Don’t you think the ice on the lake is too thin to your weight?
A.stand
B.bear
C.catch
D.take