燃料燃烧实际释放出的总热量与燃料所能释放的总热量之比称为（）_爱下问搜题

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问题单项选择题

燃料燃烧实际释放出的总热量与燃料所能释放的总热量之比称为（）。

A.循环热效率

B.空燃比

C.燃烧效率

D.比热

答案

参考答案：C

单项选择题

下列哪种牙龈炎又称奋森龈炎（）。

A.青春期龈炎

B.妊娠期龈炎

C.急性坏死性溃疡性龈炎

D.药物增生性龈炎

E.慢性牙龈炎

问答题

Topic: Can shopping vouchers increase consumption

Questions for Reference:
1. To stimulate consumption, which is more effective, tax reduction or shopping vouchers
2. What are the major purposes of issuing shopping vouchers
3. In what way can the shopping vouchers best be distributed Shall every citizen be given the same amount of shopping vouchers or should the vouchers be limited to the lower-income people only