下列( )含量增高，则钢材强度提高，但钢材的塑性、韧性、冷弯性

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问题单项选择题

下列( )含量增高，则钢材强度提高，但钢材的塑性、韧性、冷弯性能可焊性抗锈性降低。

A．(A) 硫

B．(B) 磷

C．(C) 碳

D．(D) 硅

答案

参考答案：C

单项选择题

急进性肾炎临床表现最突出者为（）

A.水肿

B.高血压

C.少尿或无尿

D.镜下血尿

E.心包摩擦音

单项选择题

An analyst does research about market supply curve. Which of the following statements is most accurate（）

A. The market supply curve is a total cost curve.

B. The market supply curve is the horizontal sum of the individual producer's supply curves above average variable cost curve.

C. The market supply curve is formed by adding the producer surplus of all individual producers.