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遥感图像处理软件的基本功能有哪些？

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汽轮机的真空度在高于（）MPa时，才可以起车

You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. For some reason, now the company wants to view the number of users who access the SQL Server instance. The company CIO assigns this task to you. You have to use Windows System Monitor to find out the concrete number. Which performance object should you capture?（）

A. SQLServer:Buffer Manager
B. SQLServer:Access Methods
C. SQLServer:General Statistics
D. SQLServer:Exec Statistic

吸光度由0.434增加到0.514时，则透光度T改变了（）。

A. 增加了6.2%
B. 减少了6.2%
C. 减少了0.080
D. 增加了0.080

船舶应设有一独立的应急电源，应急供电时间客船应保证不少于（）小时、货船（不包括救生艇、筏登乘集合地点）应保证不少于（）小时。

A. 12；1
B. 18；3
C. 36；3
D. 36；18