国开《 综合英语（3）》Unit7 单元练习 形考试题 【题目】A laser beam ________ on a single cell, on part of a cell, or even individual atoms and molecules. makes enough narrow focus is made enough narrow to focus can be made narrow enough to focus may be made enough narrow to focus 试题来源 综合英语（3） 查看整套课程试卷 此内容查看价格为0.2金币，请先登录如有问题，请联系微信客服解决！
