脱单体塔与脱泡塔在用途上有什么不同？
煤成煤的质量要求？
俞平伯在胡适《〈红楼梦〉考证》的影响下，于1923年出版了他的（），这是一部很有学术价值和影响的论著。
One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is （） ["seal water supply be cut off","make-up water supply be cut off","oil outlet valve closed or not open sufficiently","the flow rate of oil is too much"]
ISDN基本接口的终端采用（）和NT供电方式：自备电源、NT供电或通过网络来供电。 ["LINK","NT","TA","TE"]
机组间负荷分配的目的是什么？母管制汽轮发电机组和中间再热机组负荷分配的原则有何差别？
