骨髓外造血可引起____和______肿大，末梢血中可出现__________和___________。
参考答案：肝脾；淋巴结；有核红细胞；幼稚粒细胞
A．They set their own exams.
B．They select their own students.
C．They award their own degrees.
D．They organize their own laboratory work.
工件冲击磨损属于（）磨损。
A.内部因素
B.外部因素
C.静止磨损
D.摩擦
