大戟科植物常含()花()性,子房()位,常()室,()胎座,珠悬垂。果多为()果。
参考答案:乳汁;单;上;3;中轴;蒴
Known _______ one of the four greatest ancient civilizations in the world, China is attractive _______ many foreigners.
A.for; to
B.for; for
C.as; for
D.as; to
角钢、工字钢、槽钢、因钢,统称为()。
A.型钢
B.多用钢
C.冷轧钢
D.热轧钢