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灯具安装的文字表达方法用类似数学公式的文字表达式为：a-bX（cXdXL）／eXf，字符的含意正确的有（）。A.
a一某场所同类照明器的个数
B.
b一每个灯炮或灯管的容量
C.
c一灯具的型号或代号
D.
d一每盏照明灯具内安装的灯炮或灯管的数量
E.
f一安装方式
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