皮皮学，免费搜题
登录
搜题
【简答题】
示波管的电子束受到两个互相垂直的电场的作用，电子在两个的位移分别为x=Acosωt和y=Acos(ωt+ )，求在 =0°， =30°， =90°各种情况下，电子在荧光屏上的轨迹方程．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【判断题】If the importer is responsible for the insurance, the exporter should provide the insurance policy after effecting the shipment.
A.
正确
B.
错误
【单选题】若有以下函数定义,则执行函数 func(9) 调用后,其返回值是 ( ) 。 int func(int x) { int p; if(x==0||x==1) return 1; p=x-func(x-2); return p; }
A.
1
B.
5
C.
9
D.
7
【简答题】A．somewhere B．anywhere C．nowhere D．everywhere
【判断题】If the importer is responsible for the insurance, the exporter should provide the insurance policy.
A.
正确
B.
错误
【简答题】when the traders discuss the time of shipment in the contract，the exporter should consider whether he can get the goods ready before the shipment date and whether the ship is available if the goods ar...
【单选题】When traders set the time for shipment in a contract, the exporter should consider whether he can get the goods ready before the shipment date and whether the ship is available if the goods are ready....
A.
正确
B.
错误
相关题目：