难治性贫血伴环状铁粒幼细胞增多时，其诊断标准为环状铁粒幼细胞_爱下问搜题

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问题单项选择题

难治性贫血伴环状铁粒幼细胞增多时，其诊断标准为环状铁粒幼细胞的比例（）

A.大于20%

B.大于10%

C.大于5%

D.大于30%

E.大于15%

答案

参考答案：E

阅读理解

I was just going to cut my rose bushes but someone _____ it. Was it you?[ ]

A. has done

B. had done

C. would do

D. will do

多项选择题

BGA封装的具体类型有（）。

A、PBGA

B、CBGA或FCBGA

C、TBGA

D、TinyBGA