当局扇停止运转时，能自动切断工作面电源叫做（）闭锁。
参考答案：风电
When and where to build the new factory ____ yet. [ ]
A. is not decided
B. are not decided
C. has not decided
D. have not decided
在一定压力范围内，每增加单位压力时在单位质量原油中所溶解的天然气量叫溶解系数。
