为安全起见，初学游泳者常使用一块泡沫浮板，用双臂把浮板压入水中，借助浮板所受的浮力来辅助游泳．已知泡沫浮板的密度是0.1×10³kg/m³，体积为3000cm³．（ρ_水＝1.0×10³kg/m³，g=10N/kg）求：
（1）当浮板自由漂浮在水面上时，浮板受到的浮力的大小；
（2）浮板被压没入水中静止时，浮板受到双臂的压力的大小。

生物的性状就是（  ）

若要查阅孔子的言论，应从以下什么书入手  （   ）     

下列关于生活用电的说法中正确的是

A：Hi，Roger! Where is everybody? The house is very quiet．

B：Well，Mom ____the cinema with Jane．

A：How about your sister?

B：She's taking a shower right now because she ____the gym(健身房)

A：I ____the gym twice this week. It's really tiring.

B：As for Dad, he ____ the library to borrow some books．

A：So，let's go to that new cafe near the park，OK?

B：Oh，I ____there．It isn't so great．Why don't we call Mike and play basketball?

A：OK．That's a good idea．