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【单选题】
某钢筋混凝土梁受力钢筋（一层）的混凝土保护层为30mm，受力钢筋直径为20mm，则受力钢筋的计算保护层厚度as应取下列哪项数值。A.
35mm
B.
40mm
C.
45mm
D.
50mm
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【简答题】A．He becomes more independent. B．He becomes more challenging. C．He becomes more observant. D．He becomes more optimistic.
【简答题】A school bus is one that is used to take children to and from school. In the USA, about 450,000 school buses take more than 25 million children to and from school. The yellow school bus is a US icon (...
【单选题】光纤通信是将记录的声音的电信号转变成光信号，通过光纤把信号传给对方，最后把光信号转变成电信号完成通话。高分子光纤的包层厚度为（）
A.
10 μ m
B.
20 μ m
C.
30 μ m
D.
40 μ m
【简答题】A Bus Becomes a School for Migrant Children.doc
【单选题】In The Little Bus Who Liked Home Best, a municipal bus becomes envious of the _____________________ buses on the highway.
A.
great silver big
B.
great big silver
C.
silver great big
【简答题】磁力线上某点的切线方向就是该点磁场的方向。()
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