鸡蛋壳中Ca3(PO4)2、Mg3(PO4)2约占2.8％，这两种物质都属于 [

社会服务机构本质上是非营利组织，以（）为宗旨。

在EXCEL中，按CTRL十W键可以关闭工作簿。

某公司拟进行股票投资，计划购买甲、乙、丙三种股票组成投资组合，已知三种股票的口系数分别为1.5、1．0和0．5，该投资组合甲、乙、丙三种股票的投资比重分别为50%、20%、30%，全市场组合的预期收益率为9%，无风险收益率为4%。根据上述资料，回答下列问题。 

关于投资组合风险的说法，正确的是（）。

A.当投资充分组合时，可以分散掉所有的风险 

B.投资组合的风险包括公司特有风险和市场风险 

C.公司特有风险是可分散风险 

D.市场风险是不可分散风险

单斗挖掘机主要由（）、动力装置、电气系统和辅助系统等组成。

A.工作装置

B.回转机械

C.行走装置

D.铲斗

E.液压系统

Michel Marchant, CFA, recently became an independent money manager. After six months, he has only ten clients, who are family and friends. To supplement his income, Marchant accepted part-time employment as an advisor at Middleton Financial Advisors. According to CFA Institute Standards of Professional Conduct, which of the following statements about Marchant’s duty to his new employer is TRUE（）.

A. Marchant must inform Middleton about his existing clients but need not inform his existing clients about his new part-time employment with Middleton. 

B. Marchant must inform Middleton to keep his existing clients and must inform his existing clients of his new part-time employment at Middleton. 

C. Marchant need not inform Middleton about his existing clients but must inform his existing clients about his new part-time employment at Middleton.