Soon those people not educated in computer use will be compared to those who are print illiterate today.Question: The expression “print illiterate” refers to .
A. one who has never learnt printing
B. one who is not computer literate
C. one who has never learnt to read
D. one who is not able to use a typewriter
查看答案
液压缸的种类繁多, ( )只能作单作用液压缸。
A. 柱塞缸;
B. 单杆活塞缸;
C. 双杆活塞缸
D. 齿条缸
双杆活塞液压缸,采用活塞杆固定安装,工作台的移动范围为缸筒有效行程的( )
A. 1倍 ;
B. 2倍;
C. 3倍 ;
D. 4倍
当工作行程较长时,采用 缸较合适。
A. 单活塞扦
B. 双活塞杆
C. 柱塞
D. 齿条
引起土坡失稳原因在于土坡内某个面上剪应力达到了?
A. 抗剪强度
B. 抗压强度
C. 抗拉强度
D. 以上答案都不对