—_____ are the pants?
—They are 180 yuan.[ ]
A. How many
B. Whose
C. Where
D. How much
答案:D
不能观察下述哪个部位的颜色来了解呼吸功能()
A.口唇
B.四肢末梢
C.手术野
D.皮肤
E.尿液
OLT的PON口无论在什么情况下下行数据都是广播到所有ONU。