瑞氏染液中甲醇的作用：既可使_______溶解，又可将细胞_______。
参考答案：伊红和亚甲蓝；形态固定
If you feel tired, you may stop _____. [ ]
A. have a rest
B. to have a rest
C. having a rest
D. has a rest
全口义齿前牙大小的选择与下列哪一项无关
A．两侧口角线间的距离B．鼻翼外缘向下延长的垂线C．上唇线(唇高线)D．下唇线(唇低线)E．面部中线
