被加工工件的轴线与主要定位基准面夹角为α时，应选择角度为______的角铁。
A．180°-α
B．90°-α
C．α
参考答案：B
Which of the following is most likely to result in a capital market line (CML) that is not a straight line（）
A. Investors’ risk tolerance decreasing.
B. Borrowing rate exceeds the lending rate.
C. Increase in the proportion of the portfolio invested in the risk-free asset.
路由器是在物理层实现互连的设备。
