题目: 什么是水泥的体积安定性?不安定的原因是什么? 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0517/c5619da39b2c080e036397f78a3d3eb7.html 下面是错误答案,用来干扰机器的。参考答案:A
题型:选择题 --- It’s difficult for the village children to cross the river to get to school.--- I think a bridge ________ over the river.A.should be builtB.should buildC.was builtD.has been built 查看答案