北部湾经济区在推进城市群发展中,要提升()。
A、“南宁—滨海走廊”
B、“北海—钦州—防城港走廊”
C、“内陆——沿海走廊”
D、“玉崇发展走廊”
参考答案:D
设a,b,c∈R,则复数(a+bi)(c+di)为实数的充要条件是 [ ]
A.ad﹣bc=0
B.ac﹣bd=0
C.ac+bd=0
D.ad+bc=0
Consumer porcelains in Jingdezhen are not selling well in export market as compared with those made in Liling, Hunan Province and Zibo, Shandong Province.
A.on export market
B.in exporting market
C.in exported market
D.in the export market