必须按照国家有关规定经过专门的安全作业培训，并取得特种作业操作资格证书后，方可上岗作业的特种作业人员包括( )等。

A．控制中心操作员
B．垂直运输机械作业人员
C．安装拆卸工
D．爆破作业人员
E．登高架设作业人员

Mary invested $8,400 for 6 months in a certificate of deposit paying  percent simple annual interest. How much more interest would Mary have received if the interest rate on this certificate had been 9  percent simple annual interest ？（）