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[主观题]
根据国家标准GB/T224—1987《钢的脱碳层深度测定法》,测量脱碳层深度的方法有()、硬度法和碳含量测定法。
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A.四一七条码
B.UCC/EAN 128
C.库德巴码
D.CODE 39
How many people are there in the United States in 1987?
A.259 million.
B.117 million.
C.175 million.
D.240 million.