再障的病理改变哪项是正确的
A.全身红髓容量增多
B.呈离心性损害
C.组织切片可见造血细胞每平方毫米的数目减少
D.全身淋巴组织轻度增生
E.超微结构无明显的异常
参考答案:C
The captain told the sailors to their sprits when they were on the point of giving up.
A.keep up
B.pick up
C.take on
D.go on
属于机械除菌的方法是
A.火焰灭菌法B.干热空气灭菌法C.热压灭菌法D.射线灭菌法E.滤过灭菌法