通常柴油机的连杆和连杆盖是()加工的,安装时不可调换连杆盖。
参考答案:配对
Which characteristic is an advantage of Halon as a fire extinguishing medium?()
A.Electrically non-conductive
B.Relatively inexpensive
C.Effective against chemicals containing an oxidizer
D.All of the above
抚育采伐就其性质不同,分为()和()。