高空施焊时必须使用标准的防火(),戴头罩。
A.焊具
B.安全带
C.工作服
D.工具
参考答案:B
His experiences as a volunteer in the quake-hit areas have changed his attitude toward society and _______ influence his future life.
A.is to
B.was going to
C.are to
D.were sure to
有两台同容量的交流发电机组并联运行时,若1#机组有功功率小于2#机组有功功率,为使两机组担负的有功功率相等,其调整的方法是()。
A.减小1#机组发电机油门,增大2#机组发电机油门
B.增大1#机组发电机油门,减小2#机组发电机油门
C.减小1#机组励磁电流,增大2#机组励磁电流
D.增大1#机组励磁电流,减小2#机组励磁电流