【单选题】Why will the population in poorer countries increase?
A.
Because they need more labor to support the family.
B.
Because the people have the habit to have a big family.
C.
Because the people there are poorer.
D.
Because the people there want to be rich.
【单选题】在了解分析程序表(用作风险评估程序)时,分析程序不包括()。
【单选题】The author calls the Quechua empire a mandala because ______.
C.
a closed economy prevailed
D.
it was divided into four zones
【判断题】程序段G92 X35.2 Z-25.5 F2中的F2表示螺纹为2mm。
【判断题】程序段 G92 X35.2 Z-25.5 F2 中的 F2 表示螺距为 2mm 。
【单选题】多基因家族中,序列高度同源,在同一条染色体上串联排列的称为
【单选题】一个额定值为220V、 40W 的白炽灯与一个额定值为 220V 、 60W 的白炽灯串联接在 220V 电源上,则 ( ) 。