液压泵工作时,其工作压力的大小一般由负载大小决定,在额定压力范围内,负载越大,泵的工作压力也越大。
参考答案:对
中国是资源大国,又是资源小国。说是“小国”主要是因为[ ]
A.资源分散,开发比较困难
B.资源结构性短缺,有些资源需要大量进口
C.人口多,资源人均占有量少
D.资源利用不科学,浪费、损失严重,有效利用率低
The schoolboys and schoolgirls are walking along the street, _____a small redcap .
A.each of them has
B.they each have
C.every wears
D.each wearing