题目: 目前临床广泛使用的印模材料为糊剂和粉剂藻酸盐印模材料粉剂型藻酸盐印模材料含A.藻酸钾B.藻酸铵C.藻酸钙D.藻酸钠E.藻酸 答案: 参考答案:A解析:粉剂型藻酸盐印模材料的主要成分为藻酸钾、硫酸钙、磷酸三钠、硅藻土和适量的防腐剂等。调和剂为水。
题型:填空题 用所给词的适当形式或按要求填空。 1. I'm afraid I have _______ (not) time to play with you. 2. He'd like a hamburger and some ________ (fish).3. Would you like something _______ (drink)? 4. Help ________ (yourself) to some coffee, kids. 5. I can two _______ (woman ) under that big tree. 查看答案