RB保护是在电力系统、发电机或汽轮机甩负荷时,锅炉自动将出力降到尽可能低的水平而继续运行的保护。
参考答案:错
Jerry has promised to keep the secret, so he won’t tell anyone even though ______.
A.asking to
B.to be asked
C.to ask
D.asked to
含铁原料根据其生产方式为铁精矿()及冶金、化工的铁副产品和粉尘等。