关于密度的概念，下列认识中正确的是（　　）

A．同一种物质，它的密度跟它的质量成正比，跟体积成反比

B．把一块铁片压成铁饼，它的密度变大了

C．一种是实心固体，另一种是液体，只要它们的质量相等、体积相同，它们的密度一定相同

D．质量相等的两种不同物质，体积大的密度也大

You want to use the Web to let (76) users or your customers look (77) corporate information. But you want to keep installation at the user end (78) and you don’t want just. (79) to get (80) your databases. That may be where an application server enters the picture. For more user machine independent, these software packages, typically written in the (81) programming language for use on Windows (82) -based systems, act as go-betweens (83) browser-equipped end users to the databases that (84) the information they need to (85) .

A．C

B．C++

C．SQL

D．Java