()燃烧室结构紧凑、热损失小、热效率较高。
A.分开式
B.预燃室式
C.涡流室式
D.统一式
参考答案:D
They come from _____. They speak _____.[ ]
A. Brazil, English
B. Argentina, Spanish
C. France, Portnguese
D. Canada, Japanese
用灭火器灭火时,避免冲击液面,以防泡沫飞溅。()