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【单选题】
金属烤瓷唇侧肩台的宽度一般为A.
0．5mm
B.
1．0mm
C.
1．5mm
D.
2．0mm
E.
2．5mm
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A.
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B.
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C.
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D.
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A.
was traveling
B.
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C.
is traveling
D.
had traveled
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A.
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B.
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C.
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D.
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