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问题 计算题

质量为7.9千克的正方体铁块放在边长为1米的正方形的水平桌面的中央，则桌面受到的压强为多大？(ρ铁=7.9×103千克/米3，g=10牛/千克)

答案

7.9×103Pa

单项选择题

Questions 11-14

A．He has a big family.

B． He has to work at home.

C．His mother-in-law likes to have parties.

D． His children are rather naughty.
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单项选择题

新闻产品商品性的最大特点是（ ）

A．售价低于成本

B．双重出售

C．售价高于成本

D．利润至上
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