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【单选题】
假设 【图片】是来自【图片】分布的一个随机样本，则【图片】（离差平方和除以总体方差）服从A.
自由度为n-1的卡方分布
B.
自由度为n的卡方分布
C.
均值为0，方差为1的正态分布
D.
均值为μ，方差为1的正态分布
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【简答题】\t论构建信息系统安全策略\t在组织的信息化工作中，建立信息系统安全策略是其中必不可少的环节。信息系统安全策略就是指：为避免因使用计算机或应用信息系统可能导致的单位资产损失而采取的各种措施、手段，以及建立的各种管理制度、法规等。\t请以“论构建信息系统安全策略”为题，分别从以下三个方面进行论述：\t1.概要叙述你参与管理过的信息系统项目（项目的背景、项目规模、发起单位、目的、项目内容、组织结构、项...
【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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