Charles Smith, ______ was my former teacher, retired last year.
A、whichB
that不能引导非限制性定语从句,可以用which和who引导,其中,who代替的先行词是人。句意为：查理?史密斯去年退休了,他曾经是我的老师。
Inmyopinion,theyshoulddosomethingtorewardtheirmost_(produce)employees
一细长螺线管共有2000匝，其长度为0.6m，真空磁导率μ0=4π×10-7N/A2，若通过的电流为6A，螺线管内的磁感应强度为()
Attheendoftheconference,allthe_(participate)wereaskedtofilloutaquestiolmaire
Goodparentshavetheabilitytocommunicatemessagesoflove,trust,andself-worth______theirchildren
两列波的表达式分别为y1=cos2Avtx(/)和y2=cos2Avtx(/)，两波叠加后在坐标原点x=0处的振幅为()
