作为公开招标方式第一轮竞争择优活动是（）。
A、编制施工招标文件
B、发出资格预审表
C、资格预审
D、组织评标
参考答案：C
This book by a famous writer many years ago.[ ]
A. writes
B. is written
C. written
D. was written
照明灯具的工作电压通常为( )V。
A．110
B．220
C．300
D．500
