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问题 单项选择题

王刚和赵宏一起工作，1h可打出9000字的文件，已知王刚打字速度是赵宏打字速度的一半，那么赵宏单独工作1h打（）字。

A.3000

B.4000

C.6000

D.8000

答案

参考答案：C

解析：

设赵宏的打字速度为每小时x字，由条件可得到，即x=6000，选(C)．

选择题

它是综合性表演艺术，即唱、念、做、打、舞为一体、通过程式的表演手段叙演故事，刻画人物，表达"喜、怒、哀、乐、惊、恐、悲"的思想感情，角色可分为：生、旦、净、丑四大行当。2006年5月，经国务院批准列入第一批国家级非物质文化遗产名录。下列属于这种艺术形式的是（   ）

A．杂剧

B．南戏

C．黄梅戏

D．京剧
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单项选择题

Certificates are （71） documents attesting to the （72） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to （73） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （74） date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （75） of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.

A．communication

B．computation

C．expectation

D．expiration
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