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【单选题】
该工程中给水管道DN20的计算过程正确的是( )。(注意:CAD测量出的长度误差可允许在3%以内)A.
（0.828+19.106）/2+1.3-0.45+1.3-0.9=11.22m
B.
（0.835+19.099）/2+5.2-4.35+5.2-4.7=11.32m
C.
（0.828+19.106）/2+1.3-0.45+1.3-0.9+（0.835+19.099）/2+5.2-4.35+5.2-4.7=22.54m
D.
0.828+19.106+1.3-0.45+1.3-0.9+0.835+19.099+5.2-4.35+5.2-4.7=42.47m
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