手动级联需要调度两个会议,分为()和()两种方式。
A.互指上下级MCU
B.单指终端
C.互指终端
D.单指上级MCU
参考答案:C, D
润滑油(脂)在设备中的作用是什么?
This math problem is _______ than that one. [ ]
A. much easy
B. much easier
C. very easier
D. the easiest