同频干扰发生的时候可以采用调整（）和功率来降低干扰。
A.传输速率
B.SSID
C.信道
参考答案：C
用0到9这十个数字可组成______个能被5整除无重复数字的三位数．
—____________ difficulty you meet, remember that it might just be a touchstone.
—You are right. __________ difficult it is, we will never give in.
A．However; whatever
B．However; however
C．Whatever; whatever
D．Whatever; however
