立磨主减速机推力瓦采用的是()润滑,管磨的中控轴承是()润滑。
参考答案:静压;动压
Over two hundred years ________ since the United States ________in 1776[ ]
A. have passed; founded
B. has passed; were founded
C. have passed; was founded
D. has passed; was founded
在Word中,选定一行文本的技巧方法是()。
A.将鼠标箭头置于目标处,单击
B.将鼠标箭头置于此行的选定栏并出现选定光标单击
C.用鼠标在此行的选定栏双击
D.用鼠标三击此行