从众心理有利于跟上时代潮流，增进同学之间的友谊，所以我们要紧跟时代的潮流。 [ ]
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83. He is getting older and older, perhaps into his second , playing with his grandson’s toy trains all day long.
A．childish
B．child
C．boy
D．Childhood
当采用C20混凝土和HPB235级钢筋时，纵向受拉钢筋的最小锚固长度为（）d。
A.20
B.25
C.30
D.35
为（）d。