【单选题】It seems oil______from this pipe for some time. We' 11 have to take the machine apart to put it right.
【单选题】有下列仪器: 1漏斗;2容量瓶;3蒸馏烧瓶;4天平;5分液漏斗;6量筒;7燃烧匙。其中常用于分离物质的仪器是
【单选题】It seems oil______from this pipe for some time. We' 11 have to take the machine apart to put it right.
【单选题】It seems oil leaves from this pipe for some time. We'll have to take the machine apart to put it right.
【单选题】It seems oil ______ from this pipe for some time. We' 11 have to take the machine apart to put it right.
【简答题】It seems oil ________ from this pipe for some time. We’ll have to take the machine apart to put it right. A) had leaked B) is leaking C) leaked D) has been leaking
【单选题】It seems oil ______ from this pipe for some time. We'll have to take the machine apart to put it right.