单项选择题

混凝土圈梁与过梁连接着，分别套用圈梁、过梁定额，其过梁长度按门窗外围宽度两端共加（）mm计算。

A.350
B.550
C.500
D.250

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For the circuit shown in page 1157, the opamp is a () stage() op.
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