友谊皮鞋厂平均每月可以生产皮鞋692箱,一年大约可以生产皮鞋____箱?
— Mum, can you give me some advice on how to behave myself at the table?
— Well, I do have some advice. , please keep quiet while eating.
下列各项发明中,哪一项是工业革命开始的标志( )
绿色植物的叶片是光合作用最理想的场所.(判断对错)