爆炸极限的影响因素有（）。
A.温度
B.含氧量
C.压力
D.惰性气体含量
参考答案：A, B, C, D
— How long have you been here?
— Only about five minutes. Henry and Simon _____ here with me. [ ]
A. have walked
B. had walked
C. walked
D. were walking
以下哪项不是输血的适应证
A．烧伤
B．大手术出血
C．出血性疾病
D．肾衰竭
E．血液中毒
