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【单选题】
采用敲击法检查复合材料结构的修理质量时，两次敲击的间隔距离最好是A.
1inch
B.
0.5inch
C.
1.5inch
D.
2inch
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【单选题】Are they theirs ? _______. A. They are yours. B. No ,they aren't . C. No ,they are .
A.
They are yours.
B.
No ,they aren't .
C.
No ,they are .
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