下列物质的用途,既利用了物质的物理性质又利用了化学性质的是 [ ]
A.用木炭作燃料
B.用二氧化碳灭火
C.用焦炭炼铁
D.用木炭吸附工业产品中的色素
答案:B
Mr Smith __________in London for a few years before he _____to China.
A.lives; came
B.has lived; came
C.had lived; comes
D.had lived; came
物流标准化