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【单选题】
调节红细胞生成的最重要因子是( )A.
雄激素
B.
雌激素
C.
维生素B12
D.
Fe2+
E.
促红细胞生成素
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举一反三
【单选题】We learn from the second paragraph that ______.
A.
the children learn how to make their beds
B.
the Debbie' s leave home without making the beds
C.
one of the children watches TV while eating breakfast
D.
the children fail to do what their mother wants them to do
【简答题】C The questions of what children learn, and how they should learn it, is continually being debated and reheated. Nobody dares any longer to defend the old system, the parrot – fashion (way of learning...
【单选题】挤密桩是指通过沉管(锤击、震动)、冲击或爆扩方法成孔，使土侧向挤出挤密桩周土，提高桩间土的密实度和承载力。孔中填以( )击实为灰土挤密桩。
A.
灰土
B.
石灰
C.
水泥粉
D.
煤灰
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