可以鉴别再生障碍性贫血和急性粒细胞白血病的是（）

A.周围血中白细胞减少

B.周围血中粒细胞减少

C.周围血中红细胞减少

D.周围血中血小板减少

E.周围血中有原始细胞

Which hazard probably would NOT be encountered when entering an empty but uncleaned fish hold?（）

A.Lack of oxygen

B.Methane gas

C.Hydrogen sulfide gas

D.Carbon monoxide