矿井至少10天进行1次全面()
A.反风
B.测风
C.采集气样
参考答案:B
It is always true that sometimes even if you have had a big dinner, _________ are that you will still want to reach for food when it gets late.
A.problems
B.facts
C.chances
D.cases
下列选项中,关于视觉的运动规律有误的是______。
A.眼睛的水平运动比垂直运动快B.视线运动的顺序习惯于从右到左,从上到下,顺时针进行C.对物体尺寸和比例的估计,水平方向比垂直方向准确、迅速、且不易疲劳D.人眼视觉的暂停时间平均需要0.17s