在空间有正方向为水平向右,场强按如图所示变化的电场,位于电场中A点的电子在t=0时静止释放,运动过程中只受电场力作用.在t=1s时,电子离开A点的距离大小为l,那么在t=3s时,电子将处在( )
A:A点右方3l处
B:A点左方2l处
C:A点左方3l处
D:A点
Dear students,
An English lecture will be held in the lecture hall from 4 to 6 p.m. On March 7. It will be given by Professor Li Ping from Peking University. The topic is “How to learn English well”. You may take notes if you like. And you may ask questions about learning English during the break. If you are interested, please attend the lecture on time.
English Club
March 2, 2017
Dear all students,
March 12 is Tree Planting Day. We have decided to go and plant trees that day. All the students in our school are supposed to take part in this activity. We are going to gather at the school gate at 7:00 tomorrow morning. And then, we will take our school bus to West Hill. Please don't be late or absent. Pay attention to safety during the planting. Please wear sports shoes as well.
Student Union
March 11, 2017
Found
A jacket was found on the playground on the afternoon of March 1. It is a new black jacket. There is a key in the pocket. The owner can come to Room 201, Building 3 to get it.
Li Hua
Class 3, Grade 8
逻辑方法中的归纳,是从大量个别现象中概括出一般性认识的思维方式。对多种事物、现象抽取其共同之处加以概括,形成用以表达这种共同性质的概念、范畴、命题、论述等,即为归纳。下表归纳正确的是( )
①草莓 ____ ②梨 ____③食物____ ④鸡蛋____
⑤苹果____ ⑥胡萝卜 ____⑦鸡肉____ ⑧早餐____
⑨午餐____ ⑩晚餐____
下列说法与原文不相符合的两项是 ( ) ( )
A.人的心理是科学艺术赖以产生的母体,因而心理学可以被用来研究文学。
B.艺术作品作为一种心理活动的产物,带有明显的意图和自觉的形式。
C.除了在心理生理的本能和反应领域内的事物,我们都能运用因果联系去分析。
D.艺术作品和艺术活动所体现的创造性的一面能最充分地表现在人的生命中。
E.心理事件可以推导,但艺术这种创造性活动却不能建立理性的程式。