问题
选择题
—Hello! May I speak to your father?
—Sorry, he ______ Xiamen on business. [ ]
A. has been in
B. has been to
C. has gone to
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—Hello! May I speak to your father?
—Sorry, he ______ Xiamen on business. [ ]
A. has been in
B. has been to
C. has gone to
答案：C
、带电量为
的物块放在倾角
的固定光滑绝缘斜面的顶端，整个装置处在范围足够大的匀强电场中。已知电场强度大小
，电场方向水平向左，斜面高为
，则释放物块后，物块落地时的速度大小为（ ）
