第8题: [单项选择]不能零售的药品是()。 A. 毒性药 B. 试生产新药 C. 处方药 D. 甲类非处方药 参考答案:B
第9题: [单项选择]以下哪些与人造冠的固位有关() A. 约束和约束反力 B. 摩擦力 C. 黏结力 D. 固位形 E. 以上都有 参考答案:E
第10题: [填空题]Some of these studies have shown that although some people have trouble to fall asleep, others have an equally difficult time waking up.
A. have shown B. to fall asleep C. equally D. waking up 参考答案:B应改为falling asleep。 答案解析:[解析] have trouble doing sth.