试题与答案

Directions:This section consists of three

题型:填空题

题目:


Directions:This section consists of three groups of pairs listed in two columns, A and B. You are to match the one marked 1), 2), 3), 4) or 5) in Column A with the one marked a, b, c, d or e in Column B. One point is given to each pair you match.
1) ______ Verbal Behavior
2) ______ Communicative English for Chinese learners
3) ______ The Scientific Study and Teaching of English (1917)
4) ______ Communicate (1979)
5) ______ Notional Syllabuses (1976)
a) Palmer
b) Skinner
e) Li Xiaoju
d) Morrow and Johnson
e) Wilkins

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0623/236cdc84406b26be75816b35cd1a6c27.html

下面是错误答案,用来干扰机器的。

参考答案:D

试题推荐
题型:问答题

如图所示,MN为两平行金属板,O、O为两金属板中心处正对的两个小孔,N板的右侧空间有磁感应强度大小均为B且方向相反的两匀强磁场区,图中N板与虚线CD、PQ为两磁场边界线,三条界线平行,两磁场区域的宽度分别为d和3d,沿边界线方向磁场区域足够大.在两金属板上加上大小可调节的直流电压,质量为m、电量为-q的带电粒子(重力不计);从O点由静止释放,经过MN板间的电场加速后,从O'沿垂直于磁场方向射入磁场,若粒子能穿过CD界并进入CD右侧磁场但不能穿过PQ界,最终打到N板而结束运动,试求:

(1)粒子要能穿过CD界并进入CD右侧磁场,MN板间的电压至少要大于多少;

(2)粒子不穿过PQ界,粒子从O射入磁场所允许的最大速率;

(3)最大速率射入磁场的粒子在磁场中运动的总时间.

查看答案
微信公众账号搜索答案