此过程需要两个人。( )
A.For this procedure, make sure that one person is available as backup. B.Two persons are necessary to do this procedure. C.Two persons are mandatory to do this procedure.正确答案B
此过程需要两个人。( )
A.For this procedure, make sure that one person is available as backup. B.Two persons are necessary to do this procedure. C.Two persons are mandatory to do this procedure.正确答案B