人走上楼和跑步上楼的两种情况中，做功和功率的大小是（ ） A．跑步上楼比走上楼所

工程具备竣工验收条件，( )按国家工程竣工验收有关规定组织验收工作。

A．承包人

B．工程师

C．发包人

D．专家验收组

Do you like playing __小题1:_(不同的)kinds of balls? Are you­ interested in collecting balls.  I have a__小题2:__(特别的)room in my house, which is _小题3:_(满) of all kinds of balls. I have been collecting them__小题4:__（从...以来）I was seven years old. Now I have got __小题5:__(千)of them. I have run out of room to __小题6:__(贮存)them. They are all __小题7:__(围绕着)our house. By the way, I’d like to __小题8:__(创建)a Ball Collectors’ __小题9:__(俱乐部), and __小题10:__(欢迎) to join us. Click here to know more! Click here to join us now.

口袋里有10个桃子，任意摸一个，（    ）是桃子。

当单个整流模块发生故障时，需要对单整流模块进行切离直流供电系统的操作。根据不同品牌、不同系列的直流供电系统，单整流模块的切除步骤也相应不同，一般切鲤系统的步骤是什么？

如图所示该安全标志表示的意思是（）。

A.禁止吸烟

B.禁带火种

C.禁止烟火

D.当心火灾