某四面体的三视图如图所示,则该四面体的所有棱中最长的是( )
A:52
B:41
C:42
D:5
—What do you think of the robots in the future?
—I think they won't __________ do all the work like humans.
如图甲是正在工作的电磁起重机,图乙是电磁起重机内的线圈.