乙炔、氢气钢瓶与原子吸收或气相色谱仪放在同一房间，方便使用。( )
参考答案：错
I was______in the newspaper at that time, so I didn’t notice what was happening.
A．injured
B．devoted
C．buried
D．trapped
应用硝酸酯类药物导致心绞痛恶化的可能病因是（）
A.变异型心绞痛
B.主动脉瓣狭窄
C.二尖瓣关闭不全
D.法洛四联症
E.肥厚型梗阻性心肌病
