The Great Barrier Reef is included on the World Heritage list because（） ["it has the most beautiful seascape in the world","it has the greatest number of islands in the world","it has the most diverse and complex marine life in the world","it has the longest coast in the world"]
期间的重新计算
清洁生产是工业企业防治污染的方向，清洁生产的内容不包括（） ["清洁的原料","清洁的生产过程","清洁的产品","清洁的能源"]
真空过滤机含氧量不应大于（）% ["3","4","5","6"]
（）大多是单级的，可分为固定叶片式和可调叶片式两种。 ["轴流泵","混流泵","螺杆泵","离心泵"]
叙述治疗鼻鼽按摩法。
