用氧气烧渣口，当烧渣口眼内的残铁时，氧气量控制要小些，烧过渣口眼后可调大用氧量。
参考答案：对
—He says that my new car is a ____________ of money.
—Don’t you think those words are just sour grapes?
A．lack
B．load
C．question
D．waste
何谓开-关现象？
—He says that my new car is a ____________ of money.