在移动通信信号传输中,由于信号到达接收端走过多条路径,最后叠加而造成的衰落称为()衰落。
参考答案:多径
Ricky was so excited _____ he couldn't _____ words. [ ]
A. that, speak some
B. because, say
C. that, say any
D. and, say some
中心静脉压的正常值为( )
A.1~6cmH2O B.7~16cmH2OC.5~12cmH2O D.13~16cmH2OE.15~20cmH2O