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【判断题】
P-Q图 图中的横轴表示产品P(品种或种类),纵轴表示数量Q。将各类产品按数量递减顺序排列,绘制出P-Q曲线。曲线的左端表示数量很多而种类较少的产品,右端表示数量少而种类很多的产品。 M区的产品数量大、品种少,适于采用大量生产方式,加工机床按产品原则(流水线)布置。A.
正确
B.
错误
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【单选题】What should be done to prevent insects from eating into the water harvesting system at the bottom?
A.
The two bags holding the water should be put inside the metal tank.
B.
The inner bags need to be replaced every two years.
C.
The water harvesting system should be built on a platform.
D.
A cover should be used to prevent insects from eating it.
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