某封冻的河面上的冰能承受的最大压强是4×10⁴Pa，在冰面上行驶的小车质量是200kg，它与冰面的接触面积是0.4m²．在保证安全的情况下，小车上最多能装多大质量的货物？取g=10N/kg．

    Jim, Tom and Tim are in the park. It's a small park, but it's nice. They can see some animals there. There are some birds in the tree. They are yellow. They can fly high. Quack… Quack… What do you hear? Oh，Some ducks. They can swim in the water. There are seven white ducks and nine black ducks. What's that? It's a cat. It's under the tree. It's white. It can jump very fast. The children like the small animals very much.

以下关于欧洲西部的说法，正确的是（  ）

学习了法国大革命的历史后，九年1班的同学们对如何评价拿破仑展开了激烈争论，下列说法正确的是（　　）

①拿破仑是独裁者                  

②拿破仑具有卓越的军事才能，从未打过败仗

③拿破仑的对外战争具有侵略性      

④《拿破仑法典》维护了资产阶级的利益。

25+8＝____　　

42-9＝____

35-7＝____　　

50-9＝____