1967年6月我国()
A.成功爆炸第一颗原子弹
B.成功发射第一颗人造地球卫星
C.成功发射第一枚中远程导弹
D.成功爆炸第一颗氢弹
参考答案:D
Are you clear _____ what has been taught in this class? That is: Is everything that has been taught
in this class clear _____ you? [ ]
A. with; with
B. about; about
C. about; with
D. about; to
临时供气作业符合()的,作业等级上升一级。
A、临时供气时间超过48小时(含48小时);
B、临时供气单瓶供气点数超过50个点或集中供气超过8个点;
C、节假日期间;
D、在大型活动或集会地1公里范围内;
E、天气条件恶劣