25K型空调客车的一辆车上共安装（）个防滑装置的速度传感器。 A.1 B.2 C.4

The de facto standard application program interface (API) for TCP/IP applications is the "sockets" interface. Although this API was developed for ___71___ in the early 1980s. it has also been implemented on a wide variety of non-Unix systems. TCP/IP ___72___ written using the sockets API have in the past enjoyed a high degree of portability and we would like the same ___73___ with IPv6 applications. But changes are required to the sockets API to support IPv6 and this memo describes thesechanges. These include a new socket address structure to carry IPv6 ___74___. new address conversion functions, and some new socket options. These extensions are designed to provide Access tothe basic IPv6 features required by TCP and UDP applications, including multicasting, while introducing a minimum of change into the system and providing complete ___75___ for existing IPv4 applications.

73（）

A．pottability

B．availability

C．capability

D．reliability

脑卒中最常见的死因是（）。

A.脑出血

B.并发呼吸系统感染

C.并发肾功能不全

D.并发心功能不全

E.脑水肿、脑疝

生用清泻与透达并具，既善清泄气分实热和肺胃实火，又兼解肌透热的药物是 ()

A．生地黄

B．青蒿

C．知母

D．赤芍

E．石膏

（14分）Fe（OH）2由于在空气中易被氧化，制取时很难观察到白色沉淀现象，只能看到灰绿色，采用右图装置使用Fe，H2SO4（稀），NaOH溶液可在还原性气氛中制取Fe（OH）2白色沉淀，且较长时间内不变色，其中C为弹簧夹。（提示：还原性气氛如氢气环境）

（1）则锥形瓶A中应加入的药品为_________________.（2分）

（2）锥形瓶B中应加入的药品为__________________．（2分）

（3）容器A中的反应开始后，请简单写出完成制备Fe（OH）2的后续操作步骤。

①_____________________ ②_______________________________。（4分）

（4）若在反应开始之前先关闭弹簧夹C，则实验现象为：                      

                                                        ；（2分）

请写出此时B瓶中发生的化学反应的离子方程式：                             

                                              ；（4分）

下列不是PET的优势的是（）

A.灵敏度高

B.可以进行代谢显像

C.容易进行衰减校正

D.图像分辨率高

E.容易进行定量分析