正常生产中,摘除丙烯腈反应器进料联锁前()办理工作票(联锁解除手续)。
A、可不需要
B、最好
C、不应
D、必须
参考答案:D
Bill Clinton became the youngest-ever US governor when he was to represent Arkansas.[ ]
A. selected
B. chosen
C. picked
D. elected
用激光光束在光记录介质上写入与读出信息的高密度数据存储载体称为()。