钢笔一甩,钢笔水就被甩出,这是由于钢笔水具有 ;吸钢笔水是利用 作用,把钢笔水压进笔胆里。
惯性;大气压
Excuse me, could you tell me____? [ ]
A. how I can get to Beijing Zoo
B. how can I got to Beijing Zoo
C. where is Beijing Zoo
D. where Beijing Zoo was
在眼病诊断中,较有参考价值的是
A.矫正视力
B.裸眼视力
C.针孔视力
D.远视力
E.近视力