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【单选题】
管道中的半刚性管波纹状的金属螺旋管，制作金属螺旋管所用钢带应符合有关标准，并附有合格证书，其厚度一般不小于( )。A.
0.1mm
B.
0.3mm
C.
0.6mm
D.
0.9mm
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【单选题】Debt reduction
A.
Refers to any voluntary scheme that lessens the burden on the debtor nation
B.
May be accomplished through debt rescheduling
C.
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D.
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