链路自适应方式一般包括()。
A.动态信道分配
B.智能天线波束赋形
C.动态功率控制
D.自适应调制编码
参考答案:C, D
The number of tigers in Asia________ getting smaller and smaller and a large number of people_________ trying to protect them.
A.are;are
B.is;is
C.is;are
D.are;is
看图画图都应从()开始.
A.主视图
B.俯视图
C.左视图
D.右视图