【单选题】Stop cutting trees, ________ the earth will become worse and worse.
【简答题】用库仑滴定法可以测定化学需氧量 COD.COD 是指 ____________________________ 测定时加入过量的 K 2 Cr 2 O 7 , 再以 Pt 阴极电解产生 __________________ 来进行 “ 滴定 ” 的。
【判断题】按制图标准规定,1:2是放大比例。( )
【简答题】北半球的昼长,由冬至到夏至逐渐____,夏至到冬至逐渐____。夏季昼长随纬度增加而____,在北极会出现____现象。
【单选题】Stop cutting trees, _______ the earth will become worse and worse.
【单选题】Too much help sometimes means ______ no help.
【单选题】______ time went on , the weather got worse and worse.
【单选题】Things are getting _____ and _____. [ ]