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问题 填空题

如图所示，将一铁块慢慢提起离开水面的过程中，铁块所受浮力的变化情况是                  （选填“增大”、“不变”或“减小”）；若某时刻h=5cm，铁块的底面积以1.0×10-2 m2，则铁块下底面受到水的压强是                  Pa，此时铁块受到的浮力大小是                  N。（取g=10N/kg，ρ水=1.0×103kg/m3）

答案

减小，500，5

问答题 简答题

物资分区分类存放应考虑哪些因素？
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单项选择题

An (71) service bus (ESB) acts as a shared messaging layer for connecting applications and other services throughout an enterprise computing infrastructure. It supplements its core (72) messaging backbone with intelligent tansformation and routing to ensure that messages are passed (73) . Services participate in the ESB using either Web Services messaging standards (74) the Java Message Service. ESBs are increasingly seen by users and analysts as core components in (75) IT.

（74）处填（）。

A．or

B．nor

C．but

D．and
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