酒类堆放和储存应安全合理，瓶装酒的堆放以（）层为宜。
A.4—5
B.5—6
C.6—7
D.7—8
参考答案：B
When a regulatory agency requires a monopolist to use average cost pricing, the intent is to produce the quantity where the: （）
A. marginal revenue curve intersects the marginal cost curve.
B. marginal revenue curve intersects the demand curve.
C. the market demand curve intersects the average total cost curve.
将机构位置图按实际杆长放大一倍绘制，选用的长度比例尺应是（）。
A.0.5mm/mm；
B.2mm/mm；
C.0.2mm/mm；
D.5mm/mm
