化脓性脑膜炎最常见的感染途径是（） A.血行感染 B.淋巴感染 C.直接感染 D.周

Na₂FeO₄是一种高效多功能水处理剂。一种制备Na₂FeO₄的方法可用化学方程式表示如下：2FeSO₄＋6Na₂O₂=2Na₂FeO₄＋2Na₂O＋2Na₂SO₄＋O₂↑，下列说法中不正确的是(  )

A．Na₂O₂在上述反应中只作氧化剂

B．Na₂FeO₄既是氧化产物又是还原产物

C．Na₂FeO₄处理水时，既能杀菌，又能产生胶体净水

D．2 mol FeSO₄发生反应时，共有10 mol电子发生转移

语音信号数字化过程中，采用的量化方法是什么？

根据以下资料，回答91-95题。

据统计，我国2004-2007年城乡居民消费状况如下表：

另据统计，2004年农村居民人均食品消费支出为1032元。

2004年农村居民恩格尔系数约为（）。

A．14.4%

B．15.4%

C．42.7%

D．47.2%

China is to send its top negotiator on North Korea’s nuclear program to Pyongyang (36) amid international concern over the launch of (37) .
While the (38) and its ally Japan push for (39) against North Korea, China is (40) , not sanctions.
Also, the (41) to Japan says sanctions on North Korea will (42) efforts to bring the secluded state back to (43) on its nuclear program.
North Korea (44) the six-party talks in (45) after Washington imposed financial sanctions for alleged counterfeiting and (46) activities.
A broadcast on North Korean State Television (47) the missile tests, in what it called a "successful (48) ".
It said North Korea will take action against anyone who (49) them.
The Minister is reported to have told a (50) that the missile launches were (51) because of America’s sanctions against Pyongyang.
North Korea remains (52) in the face of international condemnation and has warned (53) could be carried out.
UN Security Council members will (54) discussions tonight on whether a (55) condemning the missile launches should call for sanctions.

拍卖人不得以竞买人身份参加本拍卖机构举办的拍卖活动，但可以委托他人代为竞买。