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【多选题】
压缩机经全面检修,必须试车运行,以检查压缩机各零部件的运行情况,了解压缩机的工作性能,为恢复正常运行做好准备,检修后还应进行以下试车过程( )。A.
空车试运行
B.
空气负荷运行
C.
连接制冷系统试运行
D.
水压试运行
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【单选题】-----Did you have a hard time traveling back home? -----Yes, it ______ for four days when I arrived in Guiyang and all the roads______ covered with ice.
A.
snowed, were
B.
was snowing, had been
C.
had been snowing, had been
D.
had snowed, were
【单选题】The passage mainly discusses ______.
A.
the differences in average income among countries
B.
the relationship between productivity and living standards
C.
the causes of the rise in living standards
D.
the importance of raising productivity
【判断题】The differences among languages are reflected in the differences in the worldviews of their speakers.
A.
正确
B.
错误
【多选题】There are great differences among ____________, ______________, _____________.
A.
different kinds of coal
B.
different parts of the different components of coal
C.
different coal seams of the same region
D.
different parts of the same kind of coal
【简答题】The evolution theory explains the differences in sleep among animals.英译汉
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