【单选题】()是用来描述磁场强弱和方向的基本物理量。
【单选题】()是用来描述磁场中各点磁场强弱和方向的物理量。
【单选题】She intended to be a doctor, but a serious eye infection forced her to ____ the idea.
【判断题】物质生产活动及生产方式的变化发展决定整个社会历史的变化发展,决定社会形态从低级向高级的更替和发展。
【单选题】As she walked along a , a door suddenly burst open, as though forced by someone behind it.
【判断题】电场强度是用来描述电场强弱和方向的物理量。
【单选题】Although her disease her eyesight and forced her to leave the dance floor, she refuses to fall into self-pity.
【简答题】She ____________(才告诉他真相)until he forced her to do so.
【单选题】手机移动电话机、车载移动电话机、固定电话机的有效“三包”期限为( )年?