m+n=n+m运用了加法结合律．______．（判断对错）

I want to know who________for the spoiled child.

A．is to be blamed

B．to blame

C．should blame

D．to be blamed

根据《项目融资业务指引》，贷款人可以要求借款人将（）设定质押。

A、项目资产；

B、预期收益；

C、公司股权；

D、第三方保证。

脑垂体肿瘤压迫所致的视神经萎缩，术后视力不能提高。

We have already covered the topic of network addresses. The first  (1) in a block (in classes A, B, and C) defines the network address. In classes A, B, and C,if the hostid is all ls,the address is called a direct broadcast address. It is used by a(2) to send a packet to all hosts in a specific network. All hosts will accept a packet having this type of destination address. Note that this address can be used only as a (3) address in an IP packet. Note also that this special address also reduces the number of available hostid for each netid in classes A,B，and C． In classes A, B, and C, an address with all ls for the netid and hostid (32bits) define a (4) address in the current network.A host that wants to send a message to every other host can use this address as a destination address in an IP packet. However, a router will block a packet having this type of address to confine the broadcasting to the (5) network. Note that this address belongs to class E.

空白（5）处应选择（）

A.neighbor

B.next

C.remote

D.local

( )是物业管理服务活动过程中突然发生的，可能对服务对象、物业管理企业和公众产生危害，需要立即处理的事件。

A．紧急事件
B．物业紧急事件
C．物业管理紧急事件
D．典型紧急事件