喷涂铜基合金粉时，应采用（）。
A.氧化焰
B.中性焰
C.碳化焰
D.强氧化焰
参考答案：A
-When did you meet him?
-It was on the day ____his house was broken into.[ ]
A. that
B. which
C. when
D. in which
为减轻胸膜炎所引起的胸痛应采取何卧位
A．平卧位
B．患侧卧位
C．俯卧位
D．半卧位
E．健侧卧位
