控制系统要保证电除尘器稳定运行,即保证电晕放电不受烟气因素影响而随时处于最佳状态。()
参考答案:对
Joining the firm as a clerk,he got rapid promotion,and ________ as a manager.
A.ended up
B.dropped out
C.came back
D.started off
具有消食和胃、发散风寒功效的药物是()
A.紫苏
B.藿香
C.山楂
D.神曲
E.陈皮