题目内容

当晶体管工作在放大区时，iC随iB增加而

A. 增加
B. 减少
C. 不变
D. 等于零

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Now watch the video clip. Please get familiar with the words given below and then fill in each blank with only one word.Staging is an (1) part of selling your home. For a listing to be (2) staged, excess (3) and stuff needs to be (4) to make your home more inviting. The same (5) apply to your marketing. For example, cramming too many listings on a page with small photos and (6) text has the same (7) as too much stuff in a room. Buyers won’t be able to live the room or your advertising fast enough. But there is a (8). These three simple steps will (9) your ad into an effective marketing tool and grab the attention of (10) customers.

权数对平均数的作用实质上取决于

A. 各组单位数占总体单位数的比重
B. 各组标志值的大小
C. 标志值数量的多少
D. 各组标志值占总体标志总量的比重

比较不同水平的总体平均数的代表性大小需要计算

A. 变异系数
B. 标准差
C. 全距
D. 平均差

分组资料情况下，简单算术平均数等于加权算术平均数的条件是

A. 权数不等
B. 各组标志值相等
C. 各组标志值不等
D. 权数相等