HRB400碳当量Ceq（百分比）值的计算公式是（）。

燃油锅炉若过剩空气系数太大，则排烟呈（）色。

A．浓黑

B．浅灰

C．几乎无

D．白

设计风格

A shore is a piece of securing dunnage that（）.

A.runs from a low supporting level up to the cargo at an angle

B.is also known as a distance piece

C.is placed on the deck under the cargo to distribute its weight evently

D.is run horizontally from a support to the cargo

小、中、大试件的变异系数CV分别为（）

A.≤6%、≤15%、≤20%

B.≤10%、≤15%、≤20%

C.≤6%、≤10%、≤15%

D.≤6%、≤9%、≤13%