题型:选择题 If our product ____ unsatisfactory within 7 days in any way, you can take it back.A.showsB.provesC.makesD.performs 查看答案
题型:选择题 The funny boy _______ his pockets _______ sand.A.filled … inB.filled…withC.full…withD.full…of 查看答案
题型:单项选择题 某住宅楼设有集中人水供应系统,管道总容积为1800L,热水供水温度为60℃(密度0.9832kg/L),回水温度50℃(密度0.9881kg/L),冷水温度10℃(密度0.9997kg/L),水加热器底部至屋顶冷水水箱水面为66m,则膨胀水箱的有效容积为()L。A.10.8B.108C.54D.540 查看答案