单选题:( )People went back to the countryside when they were on____ 题目分类:英语 题目类型:单选题 号外号外:注册会员即送体验阅读点! 题目内容: ( )People went back to the countryside when they were on__________. A.holidays B.bicycles C.horses D.wagons 参考答案: 答案解析:
( ) Helen made __________ to visit her parents once a month, ( ) Helen made __________ to visit her parents once a month,but she didn't keep 分类:英语 题型:单选题 查看答案
二氧化碳灭火剂输送管道安装和强度试验后应进行吹扫,吹扫介质是( )。 二氧化碳灭火剂输送管道安装和强度试验后应进行吹扫,吹扫介质是( )。A.压缩空气 B.二氧化碳气 C.氮气 D.水蒸气 分类:英语 题型:单选题 查看答案