储氢设备和发电机（）系统进行检修前，必须将检修部分与相连的部分隔断，加装严密的堵板，并将氢气换为空气，按照有关规定办理手续后，方可进行工作。
参考答案：氢气
Don't worry. He is _______ to take care of little Betty. [ ]
A. carefully enough
B. enough careful
C. careful enough
D. enough carefully
氯胺酮麻醉对心血管系统有何影响？
