【判断题】对含有悬浮物质的溶液加热时,应加沸石或玻璃珠,以避免爆沸现象产生。()
【单选题】Not until he called the secretary three times ______ that the manager went to an important meetin
A.
33.Not until he called the secretary three times ______ that the manager went to an important meeting. A.did he tell
【判断题】对含有悬浮物质的溶液加热时,应加沸石或玻璃珠,以避免爆沸现象产生。
【单选题】聚乙烯管道焊接作业人员必须取得 颁发的特种设备作业人员证。
【判断题】聚乙烯管道焊接作业人员必须取得质量技术监督部门颁发的特种设备作业人员证方可从事焊接工作。
【判断题】商品的广度是指经营的商品系列的数量,即具有相似的物理性质、相同用途的商品种类的数量。
【判断题】含有悬浮物质的溶液加热时,应加沸石或玻璃珠,以避免爆沸现象产生。
【单选题】Not until he called the secretary three times _________ that the manager went to an important meeting.