机械轨道衡机车进入台面后，应尽量停在台面的中间位置，待停稳后，先估计其重量移动大游砣，再开启示准器，移动大小游砣使秤达到（），再进行读数记录。
参考答案：平衡
—English is______ too difficult for me. I can't learn it well.
—Don't give up. Nothing is difficult if you work hard. [ ]
A. seldom
B. usually
C. never
D. always
What is the common opinion about age and work a. Work gets a lot easier after the age of 40. b. Most of one’s work is done before the age of 40. c. There isn’t much work to do after the age of 40. d. Work gets more difficult after the age of 40.
