Which of the following provinces are densely populated in Canada?
A. Saskatchewan and Ontario.
B. Ontario and Quebec.
C. Manitoba and Saskatchewan.
D. Quebec and Manitoba.
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魏晋南北朝时期,尤其到了南朝时期,士族由于自我封闭导致逐步没落。()
A. 对
B. 错
中国古代中原地区经济是以旱作为主。()
A. 对
B. 错
ZigBee规范与IEEE 802.15.4标准有什么联系?