骨髓增生异常综合征可有病态造血。
参考答案:对
He is only too ready to help others, seldom, ____, refusing them when they turn to him.
A.if never
B.if ever
C.if not
D.if any
“低声效应”告诉我们:有理不在声高,要想使孩子接受意见,就要学会克制情绪,把沟通的音调降低。