平台上安全演习的内容主要有哪些？
参考答案：
弃平台、救生（人员落水）、消防、防喷（井控）、防硫化氢、溢油演习等。
The new generation of computers, with artificial intelligence, _______and perfected now.
A．are being developed
B．have developed
C．developed
D．will develop
I have two dictionaries, _____ are of great use. [ ]
A. all of which
B. either of which
C. both of that
D. both of which
