单项选择题
依据JC/T947-2014《先张法预应力混凝土管桩用端板》标准,φ400、φ500、φ600端板DP值分别为()
A.308,406,506
B.306,406,506
C.308,408,506
D.320,406,506
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单项选择题
A.308,406,506
B.306,406,506
C.308,408,506
D.320,406,506
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