开敞式河岸溢洪道有()溢洪道和()溢洪道两种形式。
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On the pole side of the trade wind belt,there is an area of high pressure with weak pressure gradients and light,variable winds. This area is called the().
A. prevailing westerlies
B. geostrophic winds
C. doldrums
D. horse latitude
我国商标法明确保护的注册商标有()
A. 商品商标
B. 服务商标
C. 集体商标
D. 证明商标
细致包装苗木,以防失水,特别是苗冠不宜外露。
A. 正确
B. 错误