往复泵是（）循环的吸入和排出液体，周而复始的工作。A、连续 B、间歇 C、周期 D、

Anthropology is the study of human beings as creatures of society. It (1) its attention upon those. physical characteristics and industrial techniques, those conventions and values, which (2) one community from all others that belong to a different tradition.

The distinguishing mark of anthropology among the social sciences is that it includes for serious study other societies (3) our own. For its purposes any social (4) of mating and reproduction is as significant as our own. To the anthropologist our customs and those of a New Guinea tribe are two possible social schemes for (5) a common problem, and in so far as he remains an anthropologist he is (6) to avoid any weighting of one (7) the other. He is interested in human behavior, not as it is shaped by one tradition, our own, but as it has been shaped by any tradition (8) He is interested in a wide (9) of custom that is found in various cultures, and his object is to understand the way in which these cultures change and (10) , the different forms through which they express themselves and the (11) in which the customs of any peoples function in the lives of the (12) .

Now custom has not been commonly regarded as a (13) of any great moment. The inner workings of our own brains we feel to be uniquely (14) of investigation, but custom, we have a way of thinking, is behavior at its most commonplace. (15) , it is the other way round. Traditional custom is a mass of detailed behavior more astonishing than (16) any one person can ever evolve in individual actions. Yet that is a rather (17) aspect of the matter. The fact (18) first rate importance is the predominant role that custom (19) in experience and belief, and the very great varieties it may (20)

6（）

A.acknowledged

B.authorized

C.bound

D.credited

下列各句中，没有语病的一项是（3分）

A．这次问题奶粉事件对中国的乳品行业打击相当沉重，据初步统计，三鹿、蒙牛、伊利三家企业的损失达到两个多亿左右。

B．京津城际铁路开通后，京津两地居民上午11时前交寄中国邮政文件类快递件，搭乘京津城际列车，当天下午6时前就能送到收件人手上。

C．对于建筑风水究竟是科学还是迷信，大学究竟该不该开设“风水学”课程，目前学术界对此的看法是否定的。

D．最新一期的美国财经杂志《福布斯》显示：“股神”沃伦•巴菲特不仅个人净资产在33天内增加了80亿美元，而且还击败了微软公司创始人比尔•盖茨，登上首富宝座。

如图所示，处于匀强磁场中的两根足够长、电阻不计的平行金属导轨相距L=1 m。导轨平面与水平面成θ＝37°角，下端连接阻值为R的电阻。匀强磁场方向垂直于导轨平面向上，磁感应强度为B=0.4T。质量为0.2 kg、电阻不计的金属棒放在两导轨上，棒与导轨垂直且保持良好接触，它们间的动摩擦因数为μ=0.25。金属棒沿导轨由静止开始下滑，当金属棒下滑速度达到稳定时，速度大小为10 m/s。（取g＝10 m/s²，sin 37°＝0.6，cos 37°＝0.8）。求：

（1）金属棒沿导轨开始下滑时的加速度大小；

（2）当金属棒下滑速度达到稳定时电阻R消耗的功率；

（3）电阻R的阻值。

内分泌系统的反馈调节是指（）

A.神经系统对内分泌系统的调节

B.内分泌系统对神经系统的调节

C.免疫系统对内分泌系统的调节

D.免疫系统对神经系统的调节

E.下丘脑－垂体－靶腺之间的相互调节

执行下列程序后，镗孔深度是G90G01G44Z-50H02F100（H02补偿值2.00mm）

A、48mm

B、52mm

C、50mm