达标排放的技术要求,必须以建设项目的( )负荷计算。
A.平均
B.最大
C.最小
D.常规
参考答案:B
He used to _____ computer games, but now he is used to_____ a walk after supper. [ ]
A. play; take
B. play; taking
C. playing; taking
D. playing; take
抽油机、螺杆泵、电泵、水井的保修期是怎样界定的?