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利润对象的用途是?()
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利润屏障的用途是?()
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[音频]单词提示：famed=famous vehicle n.交通工具 manual adj.手工的，手动的 mode n.模式 merge v.融合，合并 minor adj. 小的，微小的One of Google's ______1____ cars _____2___ in California last month. There were ____3___. It is not the first time ______4____ has been _____5___, but it may be the first time ____6____. On February 14th the self-driving car, ____7_____ 2mph (3km/h) , ______8____ in front of _____9_____going 15mph (24km/h) . The man ____10___ reported that he ___11___ the bus would ______12_____, and so he did not ______13_____. _____14____, Google said: "We clearly _____15_____, because if our car hadn't moved, there wouldn't have been a crash." That said, ______16____believed the bus was going to slow or stop to ______17_____, and that there would _____18____ to do that." The company's self-driving cars have done well ______19_____in the US, and until now have _______20_____.
移液管又称吸量管,它是用于准确移取一定量体积溶液的量器。一般有两种类型,一种是管体中部大,两端细长,称为( )
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