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【单选题】
钢筋混凝土矩形截面,均采用钢筋直径为20的钢筋,则钢筋净距分别要求( )A.
>=25mm、>=20mm
B.
>=20mm、>=25mm
C.
>=30mm、>=25mm
D.
>=25mm、>=30mm
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A.
clean
B.
cleaning
C.
cleaned
D.
to be cleaning
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【单选题】有巢氏是( ),燧人氏是( ),伏羲氏是( ),神农氏是( )。
A.
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B.
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C.
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D.
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