【单选题】32 调节培养基的pH值常用 _____。
【单选题】镁砖属于()耐火材料,故不能与()耐火材料接触。
【单选题】Maria seldom eats food before going to bed. I never eat food ,______,
【简答题】___ 4. I never eat sloppy joes. They look as if they’ve already been eaten.
【单选题】有凸缘筒形件拉深、其中_________对拉深系数影响最大。
【判断题】I never eat lunch out.