混交林混交方法有株间混交、行间混交、（）、块状混交。
A、针阔混交
B、乔灌混交
C、带状混交
参考答案：C
执行下列指令后，(CX)值为( )。 TABLE DW 10H，20H，30H，40H，50H X DW 3 LEA BX, TABLE ADD BX，X MOV CX，[BX]
A．0030H
B．0003H
C．3000H
D．2000H
An analyst does research about total, marginal and average product curve of labor. As more labor is hired, which of the following curves initially increases and then decreases
A. The average product of labor curve, but not the total and marginal product of labor curve.B. The marginal product of labor curve, but not the total and average product of labor curve.C. Both the marginal product of labor and the average product of labor curve, but not the total product of labor curve.
