特殊光源包括防爆灯具、应急灯具、应急指示灯和（）
A、照明灯具
B、除虫灯具
C、装饰灯具
D、杀菌灯具
参考答案：C
I’ve already told you that I’m going to but it, _____.
A．however much it costs
B．how much does it cost
C．however does it cost much
D．no matter how it cost
劳动定额按（）分为全国性定额、行业定额和企业定额。
A、地域
B、使用范围
C、地区
D、工作范围
