FC751放射性测井地面面板,时间常数为()。
A、3,4,6,8秒
B、2,4,6,8秒
C、3,5,6,8秒
参考答案:A
An audience’s humorous words made us , so the lecturer couldn’t make himself .
A.laugh; hearing
B.laugh; heard
C.laughing; hear
D.laughed; to be heard
什么是浮阀板的液面落差?