氯气和二氧化硫皆可用作漂白剂.若同时用于漂白一种物质时,其漂白效果会()A、增强; 发布时间:2017-07-11 08:49 │ 来源:www.tikuol.com 题型:单项选择题 问题: 氯气和二氧化硫皆可用作漂白剂.若同时用于漂白一种物质时,其漂白效果会()A、增强;B、不变;C、减弱;D、不能确定。
题型:单项选择题 The background music in an assembly line is designed ______.A.being not listened toB.not being listened toC.to be not listened toD.not to be listened to 查看答案
题型:单项选择题 The letter was______as it was the only one ever signed by the the Queen.A.unusualB.uniqueC.rareD.scarce 查看答案