某计算机的虚拟存储系统有40位虚拟地址，32位实际地址，虚页为1M(220)。假设有效位、保护位、修改位和使用位共用去四位，所有虚页都在使用。则页表大小为 (20) ，页面的大小为 (21) 。 （20）处填（）。
A. 1M
B. 216
C. 212
D. 16M
According to the text, the end of a product’s life cycle is marked by（）
A. a sharp rise in production costs.
B. the product becoming outdated.
C. an increase in customer complaints.
D. less support from sales management.
9（）
A. Employ active listening noises such as ’yes’ or ’I see’ or ’great’.
B. It would also be wise to learn and use the names of the top assistants.
C. If not, just let them know you appreciated them speaking with you and end the call.
D. If your call is not expected, unless it will be a short call, ask the party if they have the time for you.
E. Remember, do not end the call abruptly.
F. If answering someone else’s line, be sure to include their name in your speaking.
G. In this area, proper phone technique can make or break deals or relationships.
Which problem has been sorted out
A. The position of the drinking machine.
B. The amount of light in the new office.
C. The desk plan for the ground floor.
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