填空题

The basic principles applied to natural-gas vehicles are quite different from those applied to gasoline-powered vehicles.

【参考答案】

N

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填空题

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

问答题

心情伴随我们一生。2．好心情使人愉快。3．我们往往处于复杂的心情之中。 On Mood