皮皮学，免费搜题
登录
搜题
【单选题】
(1)选择呼叫系统是一个独立的通信系统, 它可与地面电台进行通信; (2) 选择呼叫系统不是一个独立的通信系统, 选择系统是通过H F或VHF系统实现地面塔台与飞机的联系。 ( )A.
(1) 对
B.
(2) 对
C.
(1) , (2) 都对
D.
(1) , (2) 都不对
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
【多选题】The dog was named Angel because he was thought to be the writer's ________ .
A.
teacher
B.
friend
C.
playmate
D.
gudian angel
【单选题】How does Angel Falls get its name?
A.
A scientist named it Angel Falls.
B.
It's named after an American pilot who first discovered it.
C.
An American expedition named it Angel Falls.
D.
No one knows.
相关题目：