乙烯裝置操作工乙烯生產知識單項選擇題每日一練(2019.05.05)

A.0
B.2
C.50
D.100
E.-12

A.2
B.1
C.0
D.-2
E.-6

A．≤1ppm
B．≤2ppm
C．≤3ppm
D．≤5ppm

A．﹣47.7℃
B．﹣61.8℃
C．﹣82℃
D．﹣103.9℃

A．＞99.0%
B．＞99.5%
C．＞99.6%
D．＞99.90%