信道配置方式主要有哪两种？
参考答案：
分区分组配置法和等频间距配置法
—I ________ a new house recently.
—Great. When ________ you ________ it?
A．have bought, did, buy
B．have bought, have, bought
C．bought, did, buy
D．bought, have, bought
看场地必要的几点都有哪些？
