甩气体混合物与多孔固体接触，把混合物中的某个组分吸留在固体表面，这种治理技术被称为( )。
A．吸收法
B．吸附法
C．催化法
D．生物法
参考答案：B
把30%的“%”去掉，这样原数就扩大了100倍．______．（判断对错）
Which of the following statements is most accurate regarding a firm’s cost of preferred shares A firm’s cost of preferred stock is:（）
A. the market price of the preferred shares as a percentage of its issuance price.
B. the dividend yield on the firm’s newly-issued preferred stock.
C. approximately equal to the market price of the firm’s debt as a percentage of the market price of its common shares.
