【单选题】()树脂本身无害,主要卫生问题是其单体对人体有致癌和致畸作用。
【单选题】()树脂本身无害,主要卫生问题是其单体对人体有致癌和致畸作用。
【简答题】信息[社会的教育特征是什么?(2019年考研试题)
【单选题】He is the very man ________ helped the girl out of the water.
【简答题】在什么情况下凸轮机构的从动杆才能得到运动的停歇?
【简答题】在什么情况下凸轮机构的从动杆才能得到运动的停歇?
【判断题】He took the girl out hurriedly and the girl was a bit worried because she thought Henry was sometimes foolish.
【单选题】以下哪项不属于绿色饭店主题内容三要素?( )