血红素合成障碍所致的贫血是( )。
A.缺铁性贫血B.再生障碍性贫血C.海洋性贫血D.巨幼细胞贫血E.慢性病贫血
参考答案:A
解析:[知识点] 常见疾病的自我药疗
—You are late again. The class _________ for five minutes.
—Sorry. There’s something wrong with my bike.
A.began
B.has begun
C.was on
D.has been on
低料线如何处理