普通日光灯主要由哪几个部件组成？
参考答案：
普通日光灯主要部件包括灯管、镇流器、启辉器。
—The hotel business in China is as __________ as that in developed countries now.
—Yes, but we still have a long way on energy saving hotels.
A．innocent
B．curious
C．perfect
D．mature
下列物质不属于“城市空气质量日报”报道的是 [ ]
A．二氧化硫
B．氮氧化物
C．二氧化碳
D．悬浮颗粒
