活性污泥的评价指标有哪些？

鲁迅说：“至于中国所谓的手段，在我看来，有时也应该说有的，但绝非‘以夷制夷’，倒是想‘以夷制华’。然而，夷又哪有这么愚笨呢，却先来一套‘以华制华’给你看。”中国近代史上迫使西方列强采取“以华制华”策略的历史事件是[ ]

A．洋务运动

B．太平天国运动

C．义和团运动

D．五四运动

完成下列核反应方程：

+→+______________

+→_________________+

湿法人工授精的做法？

Our starboard derrick boom of hatch No.4 is badly cracked（）that it has become entirely useless.

A.at its goose neck to such a extent

B.at it's goose neck to such an extent

C.at it's goose neck for such a extent

D.at its goose neck to such an extent

广泛开展以（）和儿童权利为主题的宣传教育活动，提高公众对儿童权利尤其是儿童参与权的认识。