题目内容

市场预测的供需预测中，销售潜量(a)、需求潜量(b)、市场占有率(c)之间的关系是()。

A. a＝b÷c
B. b＝a÷c
C. c＝b÷a
D. b＝a+C

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A．monthB．yearC．weekD．day

A. month
B. year
C. week
D. day

The young man______ in this company since he graduated from Madison College five years ago.

A. was working
B. has been working
C. works
D. worked

A．alsoB．yetC．alreadyD．thus

A. also
B. yet
C. already
D. thus

对10000只灯泡进行耐用性能测试，根据以往资料，耐用时间标准差为51.91小时，若采用重复抽样方法，概率保证68.27%，平均耐用时数的误差范围不超过9小时。在这种条件下应抽取34只灯泡进行耐用性能测试。

A. 正确
B. 错误