题目内容

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

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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

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