问题
选择题
Miss Chen ______ just ______ to speak at the meeting. [ ]
A. has …been asked
B. has been …asked
C. Have been … asked
D. have …been asked
答案
答案：A
搜题请搜索小程序“爱下问搜题”
Miss Chen ______ just ______ to speak at the meeting. [ ]
A. has …been asked
B. has been …asked
C. Have been … asked
D. have …been asked
答案：A
．在轨道所在空间存在水平向右的匀强电场，电场线与轨道所在的平面平行，电场强度
．现有一电荷量
，质量
的带电体（可视为质点），在水平轨道上的P点由静止释放，带电体恰好能通过半圆形轨道的最高点C，然后落至水平轨道上的D点．取
．
．