为避免涵洞产生中间积水淤塞，或洞身下游出现逆坡现象，洞身设置

单项选择题The bodies of Burke's and Hare's victims couldn't be found by the police becauseA.they had been stolen.B.they had been strangleD.C.they had been dissecteD.D.they had been burieD.

多项选择题大米比稻谷容易受潮、发热、生霉、生虫、不耐仓储，容易陈化。所以大米仓储方法为 A、适时通风 B、低温密闭 C、“双低”仓储 D、充二氧化碳密封仓储 E、高温密闭