VDSL使用的频段为:()。
A.26KHz1--104MHz
B.300KHz--3.4MHz
C.1.1MHz--20MHz
D.4MHz--25MHz
参考答案:D
—I ________ there is going to be a football match between Class 5 and our class this Friday afternoon.
—Really? It must be very exciting.
A.have been told
B.have told
C.was told
D.will be told
气压创伤性中耳炎常有以下哪些改变()。
A.鼓膜内陷
B.鼓膜破裂
C.鼓室内积血
D.鼓膜上可出现瘀斑
E.鼓膜上钙斑