According to Mark Doyle, Africa is so poor
A. because of the systematic exploitation of Africans.
B. because of the unfavorable climate.
C. because the donation in the past didn't work.
D. because of the war.
第3题
A.绿色护套的单芯蝶形引入光缆
B.黑色护套的单芯蝶形引入光缆
C.红色护套的单芯蝶形引入光缆
D.白色护套的单芯蝶形引入光缆
第5题
A.PON上行e8-C+无线AP
B.AP外置型PON上行e8-C+POE设备+无线AP
C.LAN上行e8-C
第10题
A.PON上行e8-C
B.PON上行e8-C+POE设备
C.LAN上行e8-C+单口SFU+POE设备
D.LAN上行e8-C+单口SFU+POE设备+无线
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