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【判断题】
病原携带者一定是传染源。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】As for air quality indoors, Australians suffer a higher concentration of pollutants than people in other regions.
A.
Y
B.
N
C.
NG
【单选题】The higher the cetane number, _____ the ignition quality of the fuel.
A.
the worse
B.
the better
C.
the smaller
D.
the greater
【单选题】Fuels of high quality with their earlier ignitions will cause higher _____ pressure in cylinders of a diesel engine.
A.
compression
B.
maximum
C.
rated
D.
oil
【简答题】在入栈时,应先判别栈是否为____;在出栈时,应先判别栈是否为____。
【多选题】What quality issues differentiate higher-quality watches from lower-quality ones? Higher quality watches _________.
A.
keep good time
B.
are resistant to water and shocks
C.
are made from more expensive, better-looking materials
D.
are made from non-metallic alloy.
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