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单项选择题

压实曲线以含水率为横坐标，干密度为纵坐标，曲线上峰值点的横坐标为最优含水率，纵坐标为最大干密度。（）

A．对
B．错

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热门试题

单项选择题Which of the following statements about GVHD is wrong?

A．Allogeneic HSCT with HLA matched donors has a low incidence of graft rejection
B．The rejection rate of SAA is higher than that of leukemia
C．Removal of lymphocytes from donor hematopoietic stem cells reduces graft rejection
D．The rejection rate of SAA transplantation was independent of multiple transfusions before transplantation
E．Cord blood HSCT has a low incidence of rejection

单项选择题A、 B、 C、 D、