前照灯灯泡中的近光灯丝应安装在()。 A. 反光镜的焦点前下方 B. 反光镜的焦点前上方 C. 反光镜的焦点下方 D. 反光镜的焦点处 功率低、发光强度最高、寿命长且无灯丝的汽车前照灯是( )。 A. 半封闭式前照灯 B.氙灯 C.封闭式前照灯 D.投射式前照灯
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