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【单选题】
标准20分的计算公式为10+3·Z,标准差为:A.
0
B.
1.5
C.
3
D.
10
E.
20
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【简答题】测定易释放氰化物和总氰化物进行水样预蒸馏时，加入酒石酸、甲基橙或EDTA、磷酸的作用是什么?
【单选题】Regional__________is a cognitive structure concerns about the knowledge, attitude and anticipationtoward the people who lived in a certain region.
A.
stereotype
B.
resource
C.
cooperation
D.
conversation
【单选题】From a certain farming region, trucks can carry vegetables to market in New Mexico in two days for a total cost of $ 300. A train will carry the vegetables there in four days for $200. If reducing tim...
A.
Vegetables can be sold more profitably when shipped by train than by truck.
B.
Other than speed and cost, there are no significant differences between truck and train transportation from the farming region to New Mexico.
C.
The time required to ship vegetables by train from the farming region to New Mexico could be reduced to two days if the price for this service were raised.
D.
Most owners of vegetables in the region are more concerned with shipping costs than with the time involved in shipping vegetables to market.
E.
Transportation of vegetables by truck is worth at least $ 200 per day to owners of the vegetables in the farming region.
【判断题】In a certain region of space, the electric field is uniform. It can be proved that the volume charge density in the region must be zero based on the Gauss's law.
A.
正确
B.
错误
【判断题】In a certain region of space, the electric field is uniform. It can be proved that the volume charge density must be zero based on the Gauss's law.
A.
正确
B.
错误
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