引氮气时,先检查流程,防止乱窜,特别是在引高压氮时()才能引。
A、不用把低压设备切出
B、切不切出无所谓
C、必须切出低压设备
D、引进来后再切出
参考答案:C
In relation to the formation of a company limited by shares, explain the provisions of the Federal Law on Companies imited by Shares applicable to:
(a) The founders of a company. (5 marks)
青少年根尖周病最好选用哪种治疗法()
A.干髓术
B.根充术
C.塑化疗法
D.安抚疗法
E.空管疗法