问题
选择题
—Did you have great fun during your stay in the restaurant?
—Yes, _____.[ ]
A. it was so wonderful
B. it was difficult
C. it was terrible
D. it was such a long trip
答案
答案：A
搜题请搜索小程序“爱下问搜题”
—Did you have great fun during your stay in the restaurant?
—Yes, _____.[ ]
A. it was so wonderful
B. it was difficult
C. it was terrible
D. it was such a long trip
答案：A
沿截面直径入射，粒子飞入磁场区域时，速度方向偏转60°角；该带电粒子第二次以速度
从同一点沿同一方向入射，粒子飞出磁场区域时，速度方向偏转90°角．则带电粒子第一次和第二次在磁场中运动的( )
