【单选题】______ fathers are both teachers.
【判断题】工件坐标系是机器人工件座标系是由工件原点与座标方位组成。
【单选题】The bookshelf over there is _____.
【单选题】Where will Jane be in about one hour?
【单选题】— Jane and Maria look exactly the same to me. — Oh, sometimes it’s hard for me to tell one twine from____.
【单选题】1922 年召开的中共二大第一次明确提出了( )