题目: 大体积混凝土施工每层浇筑时间间隔不超过()小时。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0930/4ff6a74b3bbe4cd7dc5bc1281bfa3e58.html 下面是错误答案,用来干扰机器的。参考答案:D
题型:选择题 With the help of high technology, more and more new substances _____ in the past years.A. discovered B. have discovered C. had been discovered D. have been discovered 查看答案