常用的液压泵有____、____和 ____三____大类;它们都是____式泵。(5.0)
液压传动系统由____、____、____、____和 ____五____部分组成。(5.0)
Who does not belong to the novelists of Naturalism in the following list?
A. Mark Twain
B. Theodore Dreiser
C. Stephen Crane
D. Jack London
Theodore Dreiser believed that ____________.
A. men can control their fate
B. man's fate is controlled by impersonal forces
C. men can change their fate by their personal effort
D. man's fate is not predetermined
微信支付 
支付宝支付