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【单选题】
Panama lies between North and South America. It has an area of 77,000 square kilometers with a population of 1,771,000. Its official language is Spanish. Its capital is the largest city. Panama City. Columbus visited Panama in 1502 on his fourth voyage(航海). It became Spanish colony (民地) at the beginning of the sixteenth century. In 1862, when Central America rose against Spain, Panama joined Colombia, which had already declared its independence (独立). It didn't break away from Colombia until the year of 1903 to become an independent republic. The Panama canal is the country' s biggest economic asset (经济资源). Panama and the United States reached an agreement in 1997, which declared Panama would take over all the rights of the Panama Canal in 1999. Panama was a Spanish colony ________.A.
from the 16th century to the 18th century
B.
until 1903
C.
for about 200 years
D.
for 300 years and more
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【单选题】汽车的悬挂系统是指车身与车轮之间的支撑系统,由弹簧、避震器组成。在如图所示的悬挂系统中,车轴分成两段,当遇到路面不平时,一侧车轮跳动对车身的影响比较小,从而提高了汽车的平稳性。关于该悬挂系统以下说法 不恰当 的是( )
A.
可以作为汽车系统的一个子系统
B.
具有支撑功能，体现了系统动态性
C.
能使汽车更好地适应多种路况
D.
有利于提高汽车的整体性能
【简答题】汽车的车轮是由轮胎、轮毂和()组成的一个整体。
【简答题】汽车的车轮是由( ),( )组成的一个整体。