拨号上网方式所需要的硬件设备主要有计算机、电话线和( )

A．调制解调器

B．示波器

C．信号发生器

D．协议分析器

• (A) 条件(1)充分，但条件(2)不充分．
• (B) 条件(2)充分，但条件(1)不充分．
• (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
• (D) 条件(1)充分，条件(2)也充分．
• (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

Mr. Daniels deposits $10, 000 in a savings certificate earning p percent annual interest compounded quarterly. What is the value of p
(1) During the term of the certificate, he earns $18 more than he would if the interest were not compounded.
(2) He withdraws all the money six months after depositing it.