In order to make his dream ____, he worked day and night.
A:come on
B:come out
C:come true
D:come into being
废品站里几吨重的废钢铁被电磁起重机吸起并放在大型汽车上,电磁起重机对钢铁的吸引力大小可以通过改变内部线圈中的 ____大小来改变.要将钢铁放下必须 ____
狮泉河盆地风速≥17m/s的大风日数多达113.4天/年。读右图,结合所学知识,回答下列问题。
下侧漫画体现我国粮食资源的现状是( )