填空题

This passage explains the basic idea of natural gas and compares the performances of different types of NGVs.

【参考答案】

N
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填空题
The basic principles applied to natural-gas vehicles are quite different from those applied to gasoline-powered vehicles.
单项选择题
According to the author, three design types of previous researches are ______.
A．interrelated to one another
B．supplementary to one another
C．to be modified considerably
D．to be integrated into one design
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