下列选项中，哪一个是通过夹具将形状ps和物体body连接在一起： A: FixtureDef fd = new FixtureDef(); fd.shape = ps; body.createFixture(fd); B: FixtureDef fd = new FixtureDef(); fd.shape = ps;BodyDef bd=new BodyDef(); body=box2d.createBody(bd); C: Fixture fd = new Fixture(); fd.shape = ps; body.createFixture(fd); D: Fixture fd = new Fixture(); fd.shape = ps;BodyDef bd=new BodyDef(); body=box2d.createBody(bd);

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FD的全称是_______；BD的全称是_____________

楼层配线架常用( )表示. A: CD B: FD C: BD D: TD

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综合布线系统采用的主要布线部件有CD、BD、FD、TP、TO,它们分别表示:CD建筑群配线架、BD(____)FD楼层配线架、TP(____)TO信息插座(通信引出端)

能够设置标签背景色的属性是（ ）。 A: fd B: bd C: bg D: fg

image组件不支持（）图片格式。 A: JPG B: PNG C: SVG D: BMP