燃烧室结渣严重是造成燃烧不稳定的原因之一.
参考答案：对
—Do you know _______ for Hainan last week?
—Last Tuesday.
A．whenMiss Liuwill leave
B．when Miss Liu left
C．when did Miss Liu leave
D．when will Miss Liu leave
广义的成本核算是指企业为生产各种产品而支出的（）耗费之
A、燃料
B、人工
C、原料
D、各项
