问题 计算题

如图所示是一列简谐波在t=0时刻的波形图,该波的波速为80厘米/秒,方向沿x轴的负方向。试根据此图求:

(1)波形图中B点的振动方向和振幅;

(2)这列波的周期;

(3)求出在这0.15秒内质点O通过的路程。

答案

(1)向上  (2分)   A="10cm " (2分)

(2)0.2s     (2分)

(3)30cm    (2分)

完形填空

阅读下列各小题,根据括号内的汉语提示,用句末括号内的英语单词完成句子,并将答案写在答题卡上的相应题号后。

小题1:We should encourage children to read classics, most of which                       (很有益处)to the growth of our children.(benefit)

小题2:I like these blue jacket very much; it costs______________________(三倍)the one hanging in the window. (as).

小题3:They say the accident happened because the carelessness of the driver, but in my opinion, it is the cyclist rather than the driver _____________________(应负责任).(blame)

小题4:_____________________ (一旦被发现偷东西)in the supermarket, any salesperson will be fired at once. (once)

小题5: Project Hope aims at helping more children in poor areas to          _  (有受教育的机会 ) .  (access,receive)

小题6:Never        (我碰到过)such a person. with a talent for songwriting in the past ten years.(come)

小题7:. If you were cast away on a deserted island,              (你会怎么办)? (do)

小题8: The headmaster left word with my parents                (他要来拜访)next Sunday . (pay)

小题9: After the war, a new school building was put up___________________________ (在曾经是一家剧院的地方). (where)

小题10:The officials were discussing the plan that they would like to see                (实现) the next year . (carry)

多项选择题