GGGT-150型轨道衡，型号中的150代表最大称量，T代表（）。

由加速度的定义式a=△v/△t可知[ ]

A．加速度a与速度的变化△v成正比

B．加速度a与时间△t成反比

C．加速度a的方向与速度v的方向相同

D．△v/△t叫速度的变化率，就是加速度，它是描述速度变化快慢的物理量

（1）关于电磁打点计时器的使用，下列说法正确的是______

A．电磁打点计时器使用的是10V以下的直流电源

B．在测量物体速度时，先让物体运动，后接通电源

C．使用的电源频率越高，打点的时间间隔就越小

D．纸带上打的点越密，说明物体运动的越慢

（2）电磁打点计时器是测量时间的仪器，其工作电压约为______V，电源频率是50Hz，它每隔______ s打一次点，在测定匀变速直线运动加速度实验中，某次实验纸带的记录如图所示，纸带上O、A、B、C、D、E、F、G为计数点，每相邻两个计数点间还有4个点没有画出，由图可知纸带的加速度等于______，在打D点时纸带的速度为______保留两位有效数字），F到G的距离为______cm．

辽沈、淮海、平津三大战役  [ ]

A、基本消灭了国民党军队的主力

B、宣告了国民党 * * 的覆灭

C、解放了中国全境

D、持续了半年多时间

It is clear that we are rapidly becoming a global culture. New forms of information technology, intercontinental travel, and the complex nature of economics are all elements in such a change. Japan, an ancient (1) culture, now dominates the West economically while its own traditional (2) is rapidly becoming (3) in the process.
It does not take a great deal of analysis to see the vast interchanges of cultural influences in the world today. The thirst for (4) fashions, popular music, and the other elements of consumer culture (5) great inroads in non-Western lands while the West seeks out everything from the religious traditions of the Ease (6) the art and music these countries produce. In the field of (7) , to cite one conspicuous example, contemporary readers seek books (8) those of the West. Latin American authors, as well as those from Africa, Asia, and India, now find appreciative audiences.
A (9) culture does not mean a unitary or "one world" culture. It does mean that people are increasingly aware of the diversity of culture. World events enter our living rooms so that things that may once have been (10) of as distant (11) now greet us immediately and in color. We may watch those events on a television made in Japan while wearing clothes sewn in Thailand and shoes made in Hungary while snacking (12) food grown in Mexico. Such an economic interdependence reflects the reality of a global banking system, the globalization of the economy, and the increasing (13) of information and information technologies.
(14) has this shrinking of distances (and attitudes) become more clear than in the academic debates over what constitutes a liberal (15) education today. Is it possible (or desirable) to have the Western core of humanities (16) the center-piece of a curriculum The place of non-Western and non-traditional cultures as part of the general (17) of a student is hotly argued in educational circles. The very fact of that discussion (18) to the emergence of a global consciousness with a continued shrinking of parochial attitudes. The (19) that such globalization is hotly debated only emphasizes the profound nature of the (20) taking place in our culture.

天然气是一种洁净能源，即使泄漏了也不会爆炸。