The Air Waybill serves as（）.
A. a document of title to the s
B. a contract for transporion
C. a receipt and delivery of shipment
D. a convention for air transport
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稳定阶段主要是指转移到活性污泥上的有机物为微生物所利用（）
Normally the marine bill of lading has three functions， namely（）.
A. evidence of the contract of carriage
B. a receipt of s
C. a document of title to the s
D. the contract of carriage
常言道： “平安易老，磨难长生 ”，《＜孟子＞二章》中 “_____，_____”也表达了类似的观点
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