下面哪些样式设置可以清除层的浮动继承 A: .clearfloat{ clear:both;} B: .clearfloat{ clear:both;height:0;font-size:0; } C: .clearfloat{ float:left;} D: .clearfloat{height:0pxline-height:0px;;}

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有以下定义:classBox{intwidth,length,height;public:voidset(intx=0,inty=0,intz=0){width=x;length=y;height=z;}};Box*box;则以下哪种使用是正确的___ A: box->width=3; B: cout<height; C: box->set(1,2); D: p.set(1,2);

{html,body { margin: 0; padding: 0; width: 100%; height: 100%; }代表需要撑满整个浏览器}

下列草图用旋转特征工具不能生成实体的是（）。1、<img width="50" height="100" src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/0c0ba8db9acf4933a0e5df79d9dddaea.png" border="0" vspace="0 &nbsp; &nbsp;&nbsp; 2、<img width="60" height="100" src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/341180a27efb4211b512ab4269ae865a.png" border="0" vspace="0 &nbsp; &nbsp;&nbsp; 3、<img width="80" height="100" src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/97007edcda2644d78d09b1089aa9af7a.png" border="0" vspace="0 &nbsp; &nbsp;&nbsp; 4、<img width="80" height="100" src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/6a56890b40874f78a8df75419e014d27.png" border="0" vspace="0

有以下定义： class Box{ int width，length,height； public： void set(int x=0,int y=0,int z=0) {width=x;length=y;height=z;} }； Box *box; 则以下哪种使用是正确的___

设，>0，则必定存在一个正数δ，使得[imgwidth="69"height="...4dc61805f98123.png"]