由长期的地表水搬运,在河流阶地沉积而成的土为()
A.冲积土
B.洪积土
C.湖积土
D.残积土
参考答案:A
It was so cold that they had the fire _____ all night.
A.to burn
B.burn
C.burning
D.burned
应先进行何种治疗
A.头罩吸氧
B.持续气道正压呼吸(CPA
C.气管插管,机械通气
D.肺表面活性物质治疗
E.吸入一氧化氮