题目内容

下列选项中______不是非正规就业的特征。

A. 容易进入的行业
B. 小规模经营
C. 资本密集型
D. 劳动密集型

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A salesperson works 50 weeks each year and makes an average (arithmetic mean) of 100 sales per week. If each sale is worth an average (arithmetic mean) of $1,000, then what is the total value of sales made by the salesperson in a year

A. $50,000
B. $100,000
C. $500,000
D. $1,000,000
E. (E) $5,000,000

采用植物区系作为群落分类原则的是( )。

A. 英美学派
B. 法瑞学派
C. 原苏联
D. 中国

拉恩基尔(C. Raunkiaer)频度定律表明( )。

A. 属于低级频度的种类通常较多
B. 低频度种的数目较高频度种的数目少
C. 频度越高的种的数目越低
D. 频度越高的种的数目越高

Which of the following can be expressed as the sum of three consecutive integers

A. 17
B. 23
C. 25
D. 30
E. (E) 40

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