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在空气中有一劈尖形透明物,劈尖角q =1.0×10-4弧度,在波长l=700nm的单色光垂直照射下,测得两相邻干涉条纹间距l=0.25cm,此透明材料的折射率n=( ).

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The engines with pistons are often called()

A. rotary engines
B. reciprocating engines
C. gasoline engines
D. internal combustion engines

In gasoline engines () are used to ignite the fuel - air mixture , producing the power .

A. gasolinel
B. spark plugs
C. diesel
D. three - sided rotor

Almost all compact cars are equipped with () engines .

A. 4 - cylinder
B. 6 - cylinder
C. 8 - eylinder
D. 1 2 - cylinder

Inline 4 - cylinder engines are often found in almost all()

A. intermediate cars
B. compact cars
C. full - size cars
D. heavy - duty trucks

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