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【单选题】
对处理事件有严格时间限制的系统是( )A.
分时系统
B.
实时系统
C.
分布式系统
D.
网络操作系统
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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】带式输送机中 缓冲托辊的安装位置是( )。
【单选题】The pioneers who settled the west in the 1860s had to handle ____ living condition, and severe weather. [ ]
A.
primitive
B.
sensitive
C.
unique D .fundamental
【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.
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