实现互换性的基本条件是制定合理的()制度和采用相应的技术测量措施。
参考答案:公差配合
We want a P.E. teacher to teach soccer, volleyball and tennis. We _____ want a music teacher to teach guitar,
piano and violin. [ ]
A. even
B. either
C. too
D. also
有一种CD光盘,用户可以自己写入信息,也可以对写入的信息进行擦除和改写,这种光盘的英文缩写为_________。