in a plane geometry ,the sum of the internal anglesfo any triangle（ has） equal to 180 degrees为什么把has改成is

in a plane geometry ,the sum of the internal anglesfo any triangle（ has） equal to 180 degrees为什么把has改成is 请教一个托福题~In plane geometry,the sum of the internal angles of any triangle has always equal to 180 degree.请问这句话哪里错了? 乘坐飞机说成by plane和 take a plane那么可以说成in a plane a trip in a plane等于什么? 坐飞机英语是介词on a plane还是in a plane不要回答是by plane 或take a plane they go to hainan 【】A.by plane B.by the plane C.by a plane D.in plane they go to hainan( ) A by plane B by the plane C by a plane D in plane选择. is,in,plane,the,there,sky,a I fly a plane in the city 英语翻译If the geometry of the instrument is perfect,then when the rotation axis is vertical the tansit axis will be horizontal and the line of sight will sweep out a vertical plane when the telescope is elevated or depressed How do you get to Beijing?----____.A.On plane B.By a plane C.In plane D.On a plane Q:A plane crashed.Why nobody in the plane got injured?A:___________________ He missed his plane ( )India A.inHe missed his plane ( )India A.in B.to Cwith How are they going to Hangzhou They are going there（ ）A·on plane B·take a plane C·in plane D·by plane 有in a plane,on a plane词组吗?它们有区别吗?one day we flew in the sky in a small plane from an airport nearby. in a plane乘飞机,可不可以将a变成the? There was a plane ___(fly) in the sky A plane is flying_____the cityA onB atC aboveD in