再生障碍性贫血
A.全血细胞减少B.红细胞及血小板正常C.红细胞及血红蛋白均减少D.血小板减少并有形态异常E.周围血有大量原始和幼稚白细胞
参考答案:A
Jane likes singing. We often hear her ______ after class. [ ]
A. sing
B. to sing
C. sings
D. sang
简述YJ19卷烟机起动按钮作用。