乙烯精馏塔停车后，要与其它系统隔离。
参考答案：对
By 1820 the population of New York had grown to about 125,000, _____ it the largest city in the USA. [ ]
A. making
B. made
C. to make
D. to be made
DNS域名系统主要负责主机名到（）的解析。
A.IP地址
B.MAC地址
C.网络地址
D.主机别名
