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【单选题】
外径千分尺的读数方法是A.
先读小数,再读整数,把两次读数相减,就是被测尺寸
B.
先读整数,再读小数,把两次读数相加,就是被测尺寸
C.
读出小数,就可以知道被测尺寸
D.
读出整数,就可以知道被测尺寸
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