功率是表示______的物理量，某物体的功率是100W，它表示该物体______

—How was your weekend?

—We ______ great fun playing in the park. 　 [ ]

A. have

B. were

C. had

D. has

_____ you read the instructions closely, you would know what I _____ referring to now.    [ ]

A. Had; was        

B. Should; am         

C. Had; am        

D. If; was

As we all know, many Chinese words have come into English, ______ typhoon, tofu and kung fu.

A．for example

B．that is

C．such as

D．so as to

细菌"核质以外的遗传物质"是指

A．mRNA

B．核蛋白体

C．质粒

D．异染颗粒

E．性菌毛

电气化铁道区段车站集中防护柜的机壳应对地绝缘，并在柜前铺设绝缘垫。