Internet的雏形是( )。
A. Netware
B. Ethernet
C. Localnetwork
D. ARPA
应用球磨机粉碎,球与物料的合理装量为
A. 占圆柱筒容积的15%~20%
B. 占圆柱筒容积的1/3
C. 占圆柱筒容积的50%~60%
D. 占圆柱筒容积的60%~80%
E. 没有具体要求
If you()me about it earlier, I would have been more careful to do it.
A. have told
B. had told
C. told
D. tell
在Word文档中,要产生段落标记,应该输入( )。
A. Enter键
B. Shift+Enter组合键
C. 分布符
D. 分节符