施工缝处混凝土表面强度达到（）以上时，才允许继续浇筑混凝土。

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问题单项选择题

A、1.2kN/mm²

B、1.2N/mm²

C、1.2kg/mm²

D、1.2g/mm²

答案

参考答案：B

选择题

Americans eat ________as they actually need every day.

A．twice as much protein

B．twice protein as much twice

C．twice protein as

D．protein as twice much

单项选择题

属于吞噬细胞缺陷

A．慢性肉芽肿
B．DiGeorge综合征
C．Bruton病
D．SCID
E．补体缺陷病