人身体的表面积大约是1.5m2,当大气压约为105Pa时,该人的身体表面受到的压力约是 N。人没有被压扁的原因是 。
1.5×105 人体内也有几乎相等的气压与外界气压平衡
影响血涂片厚薄的因素有()
A.血滴大小
B.推片与载玻片间的夹角
C.推片速度
D.血细胞比容
E.以上都是
Since nuclear (核) pollution broke out in Japan, in March, 2011, we are all _____ of it very much. [ ]
A. frightened
B. be frightened
C. frightening
D. be frightening