在追寻科学家研究足迹的过程中，某同学为探究恒力做功和物体动能变化间的关系，采用了如图l 所示的“探究物体加速度与物体质量、受力之间关系”的实验装置。

（1）实验时，该同学想用钩码的重力表示滑块受到的合力，为了减小这种做法带来的实验误差，你认为在实验中应该采取的两项措施是____________和____________；

（2）如图2所示是实验中得到的一条纸带，其中A、B、C、D、E、F是连续的六个计数点，相邻计数点间的时间间隔为T，相邻计数点间距离已在图中标出，测出小车的质量为M，钩码的总质量为m。从打B点到打E点的过程中，为达到实验目的，该同学应该寻找____________和____________之间的数值关系（用题中和图中的物理量符号表示）。

The de facto standard application program interface （API）for TCP/IP applications is the "sockets" interface. Although this API was developed for （1）in the early 1980s. it has also been implemented on a wide variety of non-Unix systems. TCP/IP（2） written using the sockets API have in the past enjoyed a high degree of portability and we would like the same（3） with IPv6 applications. But changes are required to the sockets API to support IPv6 and this memo describes these changes. These include a new socket address structure to carry IPv6 （4）, new address conversion functions, and some new socket options. These extensions are designed to provide Access to the basic IPv6 features required by TCP and UDP applications, including multicasting, while introducing a minimum of change into the system and providing complete （5）for existing IPv4 applications.

（1）是（）

A.Windows

B.Linux

C.Unix

D.DoS