乙级工程造价咨询企业可以从事工程造价( )万元人民币以下的各类建设项目的工程造价咨询业务。
A.1 000B.3000C.5000D.7000
参考答案:A
A boy with two dogs _______ when the earthquake happened. [ ]
A. were sleeping
B. were asleep
C. was sleeping
D. fell asleep
人体的安全电压一般定为()伏,但在特别潮湿,且地面可以导电的厂房内,安全电压定为()伏。