铁碳平衡图上，C点的含碳量是（）。
A、0.77%
B、2.11%
C、4.3%
D、6.69%
参考答案：A
车轮内侧距三点差最大值（）。
A、2mm
B、3mm
C、5mm
An analyst does research about future transaction. In general, which of the following is least likely to prefer for an investor to terminate a future contract at expiration（）
A. Delivery.
B. Closeout.
C. Cash settlement.
