秘书部门的主要作用是事务助手和( )
A．智谋助手
B．专项职能助手
C．文书处理助手
D．监督执行助手
参考答案：C
With respect to closed-end investment companies, generally they:（）
A. buy shares back from investors who want to sell.
B. have the market price of their shares determined by supply and demand.
C. sell additional shares only through the secondary market.
在光线不足的作业场所及夜间作业的场所均应有足够的（）。
