冷轧带肋钢筋CRB550抗拉强度σb指标值为（）。 A.500Mpa B.550Mp

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问题单项选择题

冷轧带肋钢筋CRB550抗拉强度σb指标值为（）。

A.500Mpa

B.550Mpa

C.600Mpa

D.650Mpa

答案

参考答案：B

选择题

( ) 1. My friend has a big nose, a big mouth and two small eyes.	A.
( ) 2. My friend likes sports.	B.
( ) 3. My friend has long hair, two big eyes and a small nose.	C.
( ) 4. My friend has short hair. He likes painting.	D.
( ) 5. My friend has long hair. She likes music.	E.

判断题

正压气力除灰系统一般用来输送干细灰。