孔子提倡“礼”的含义主要指
①自觉地约束自己 ②广泛地体贴、理解别人 ③加强个人修养 ④言行举止符合社会规范 [ ]
A.①②③④
B.①②③
C.①③④
D.②③④
答案:C
Some children are too selfish today. They should be taught to _____things with others so that they will
show concern for others. [ ]
A. live
B. give
C. share
D. enjoy
如图所示的匀强电场场强为103N/C,ab=dc=4cm,ac=bd=3cm.则下述计算结果正确的是( )
A.ab之间的电势差为40V
B.bc之间的电势差为50V
C.将q=-5×10-3C的点电荷沿矩形路径abdc移动一周,电场力做功是-0.25J
D.将q=-5×10-3C的点电荷沿abd或acd从a移动到c,电场力做功都是-0.25J