计算题：一螺杆端部直径D=25mm，要铣成方形作为扳手用，要求开口为20mm，问铣好后平面部分的宽度A=？
参考答案：
An analyst does research about short-term funding from bank. Under which of the following short-term funding methods does a company sell receivables to a third party（）
A. Factoring.
B. Line of credit.
C. Banker's acceptance.
典型的金本位制形式是（）
A.商业信用
B.仅汇兑本位制
C.金块本位制
D.金币本位制
