The sampling sites with relatively lower PAHs concentrations were from north mountainous area of Hebei and alluvial plain of northwestern Shandong.
而浓度低值点一般位于河北省北部包括张家口和承德北部地区以及山东西北部的冲积平原地带。
Heilonggang Area which located in the southeast of Hebei province and the northern half of the Huang-Huai-Hai plain is an important part of the Haihe plain.
黑龙港地区位于河北省东南地区，位于黄淮海平原的北半部，是海河平原的重要部分。
The comparison experiments were conducted with 11 domestic and overseas alfalfa varieties in the Hebei Lowland Plain Area.
在河北低平原区对引进的11个紫花苜蓿品种进行了三年的比较试验。
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