万能工具显微镜最后通过（）。
A.聚光镜进行观察
B.物镜进行观察
C.目镜进行观察
D.棱镜进行观察
参考答案：C
Jasmir Singh, CFA, is a famous economist and does research about capital market. Which of the following factors most likely affects the demand for capital and not supply of capital（）
A. Marginal revenue product of capital.
B. Income.
C. Interest rates.
生铁中含量最高的非金属元素是[Si]。（）
