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【单选题】
精益生产的两大支柱是:A.
价值流和一个流
B.
消除浪费和不良品
C.
准时化和自働化
D.
准时化和5S
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A.
since
B.
because
C.
despite
D.
though
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A.
has become
B.
became
C.
becomes
D.
has been
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【单选题】The IPCC announcement three years ago that 'most of the warming observed over the last 50 years is'______.
A.
possibly due to human activities
B.
possibly because human activities
C.
due to likely human activities
D.
human activities likely attributable
【单选题】关于天体和天体系统的说法正确的是 [ ]
A.
天体是宇宙中各种物质的通称，其体积和质量都大于或等于月球，小于或等于太阳
B.
所有天体都相互吸引、相互绕转，处于不断运动之中
C.
总星系是目前人们所能观测到的宇宙部分
D.
银河系的中心部分是河外星系
【简答题】How old is “old”? The answer has changed over the years. Two hundred years ago，you were old at 35.At the beginning of the 20 th century，the average life span（平均寿命）was 45. In 1950，70-year-olds were re...
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