系列机之间存在功能上的()。
参考答案:向下兼容
Kate often goes to work _____ breakfast. It's bad for her health. [ ]
A. with
B. without
C. on
D. not have
万能游标量角器由于拆装移动(),所以能获得较大的测量范围。
A.直尺
B.直角尺
C.直尺+直角尺
D.角度尺