制做圆柱形通风管需要的铁皮的面积，应该是计算侧面积．
故选：A．
The singer’s flight was _____ due to bad weather, resulting in the show _____.
A．put out; to be canceled
B．put off; to be canceled
C．put out; being canceled
D．put off; being canceled
运转部位的中心不正不是造成泵震动或有杂质的原因。
