第2题: [单项选择]常用于电镜研究的固定剂是() A. 80%~90%乙醇 B. 10%甲醛 C. 1%~2%锇酸 D. 0.3%~5%醋酸 E. 甲醇 参考答案:C 答案解析:锇酸是电镜研究常用的固定剂,对细胞里细微的构造能够良好的固定,并为脂肪性物质的唯一固定剂,因此在线粒体及其他细胞器的研究中常常使用。
第8题:[单选题] The father shouted to the mountain to ______ . A. find out who was repeating his voice B. have fun with other people in the mountain C. show more examples to his son before giving him the answer D. let his son know whose voice was louder 参考答案:C