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【单选题】
一般液压系统由动力元件、执行元件、（）和辅助元件四部分组成。A.
制动元件
B.
换能元件
C.
控制元件
D.
驱动元件
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举一反三
【单选题】Which of the following factors account for the limited impact of railroads in the 1860s?
A.
Other modes of transportation did not come to an end when the first train appeared.
B.
There was little government subsidy.
C.
People doubted that railroads stretching desert, mountain, and semiarid plain could be profitable.
D.
Economists and congressmen strongly opposed the idea of linking the East and West together through railroads.
【简答题】JAC牌货车的运输率是拖拉机的2.5倍，大型集装车的运输率是JAC牌货车的3倍，现有一堆货物，用JAC牌车运，要6小时，如果改用拖拉机运一半，再用大型集装车运另一半，一共要用多少小时？
【单选题】MID的格式()。
A.
=MID（文本参数）
B.
=MID（文本参数，截取位数）
C.
=MID（文本参数，起始位数，截取位数）
D.
MID（参数1，参数2，……）
【简答题】n. 程序,进行,过程
【单选题】Which of the following is NOT true about the American transportation in the 1860s?
A.
The impact of railroads was still limited.
B.
Passengers and freight had to transfer from railroads to other modes of transportation to reach western destinations.
C.
Wagon freighters continued operating.
D.
Railroad travel was quite expensive.
【简答题】[A] the 1860s [B] 1860’s [C] the 1860 [D] 1865s
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