问题
选择题
选择与画线部分意思相同或相近的选项。
When I reached the station , the train had already left. [ ]
A. went back to
B. got to
C. left
D. returned to
答案
答案：B
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选择与画线部分意思相同或相近的选项。
When I reached the station , the train had already left. [ ]
A. went back to
B. got to
C. left
D. returned to
答案：B
=50T，已知两板间距离d=0.3m，电场强度E=50V/m，M板中心上有一小孔P，在P正上方h=5cm处的O点，一带电油滴自由下落，穿过小孔后进入两板间，若油滴在t=0时刻进入两板间，最后恰好从N板边缘水平飞出。已知油滴的质量 m=10
kg，电荷量q=+2×10
C（不计空气阻力。重力加速度取g=10m/s2，取π=3）求：
