【简答题】将区间改写成集合(-∞,-3)=____________________
【单选题】We ran to the trees, ___ we couldn't see any more monkeys.
【简答题】《红楼梦》是曹雪芹批阅 载,增删五次,只写成80回稿。
【单选题】It was so dark that we couldn't see each other 's faces .
【单选题】We couldn't see _____ because the light in the room was poor. [ ]
【简答题】电动势的单位与电压单位相同,也是伏特(V)。电动势是一个标量,同电流一样也有自己的规定方向,即规定:自负极通过 ________ 到正极的方向为电动势的方向。
【单选题】It was do dark that we couldn't see each other 's faces .
【判断题】电动势的方向与电压一样,都是从正极指向负极( )
【单选题】测定水中六价铬时,所用的玻璃仪器,不应采用( )洗涤