​我国中等收入阶层人数已达3亿，占全球中等收入群体的30%。‍ A: China's mid-income class has reached 300 million, accounting for 30% of the middle-income group globally. B: China's mid-income class has reached 3 billion, accounting for 30% of the middle-income group globally. C: China's mid-income class amounted to 30 million, accounting for 30% of the middle-income group globally. D: China's mid-income class amounted to 3000 million, accounting for 30% of the middle-income group globally.

已知三阶矩阵$A$满足$\mid A-E\mid=\mid A-2E\mid=\mid A-3E\mid=0$，则$\mid A\mid$=( )。 A: $4$ B: $6$ C: $12$ D: $3$

我国中等收入阶层人数已达3亿，占全球中等收入群体的30%。 A: China's mid-income class has reached 300 million, accounting for 30% of the middle-income group globally. B: China's mid-income class has reached 3 billion, accounting for 30% of the middle-income group globally. C: China's mid-income class amounted to 30 million, accounting for 30% of the middle-income group globally.

P3-24: A consistent income gap.|A decreasing income gap.|An increasing income gap.|No income gap.

设$A,B$是$n$阶正交矩阵，且$\mid A\mid=-\mid B\mid$，则( ). A: $A+B$可逆 B: $A+B$不可逆 C: $\mid A+B\mid=1$ D: $\mid A+B\mid=-1$

a good (or service) whose consumption declines as income rises and increases as income decreases increase in income=decrease in consumption decrease in income=increase in consumption

Excel2010从18份身份证号中获取出生日期可以使用（）函数。 A: MID(A1,6,8) B: MID(A1,7,8) C: =MID(A1,6,8) D: =MID(A1,7,8)

The supply of loanable funds, or “national saving,” is<br/>equal to ____ A: income - consumption. B: income - consumption - taxes. C: income - consumption - government spending. D: income - consumption - government spending - taxes.

_____________ income refers to the income that one can spend after paying one’s income tax, social security contributions, etc. (dispose)

船舶电台海上移动业务识别码的组成是( )。 A: MID X1X2X3X4X5X6 B: 0 MID X1X2X3X4X5 C: 00 MID X1X2X3X4 D: 00 MID X1X2X3X4X5