如果被检测污染物中有一项超过规定的限值，则认为排放不合格。（）
参考答案：对
It was in the USA that I made the_________of Professor Jack. [ ]
A. acquaintance
B. association
C. recognition
D. acknowledgement
A．mgtgθ
B．mgsinθ
C．μmg
D．μmg
mgtgθ
mgsinθ