【判断题】管道安装时,不锈钢螺栓、螺母应涂以二硫化铝
【判断题】管道安装时,不锈钢螺栓、螺母应涂以二硫化钼。
【单选题】We are taught that a business letter should be written in a formal style __ in a personal one.
【单选题】青皮红肉鱼中的有毒物质,主要是因为青皮红肉鱼中有较高含量的( )
【单选题】We are taught that a business letter should be written in a formal style______in a personal one.
【简答题】青皮红肉鱼中的有毒物质 , 主要是因为青皮红肉鱼中天然有较高含量的 _______ 。
【单选题】We are taught that a business letter should be written in a formal style in a personal one.
【单选题】.We are taught that a business letter should be written in a formal style ____ in a personal one.
【判断题】管道安装时,不锈钢螺栓、螺母应涂以二硫化钼