对称轴
参考答案:
是一假象的直线,相应的对称操作为围绕此直线的旋转,物体绕该直线旋转一定角度后,可使相同部分重复。
Indians always shake (摇) their heads when they talk to others. (41) does not have the same meaning (42) "no". If someone wants to visit India, (43) should know this, (44) it will give him some trouble. One day, a foreign officer went to India on business. He hired (雇佣) a car and an Indian to drive it. When he (45) the driver to send him to his office, the driver shook his (46) at once. The officer repeated his order, and the driver (47) so again. At last, the officer, of course, got (48) . " (49) dare you refuse (拒绝) my order" he shouted. "Drive me to office immediately!" The driver answered (50) quite a loud voice, too. "Yes, sir !" But he still shook his head at the same time. Suddenly the officer realized that, "No means Yes here!\
[A] and[B] but[C] or
《人民警察法》的立法宗旨包括()。
A、维护国家安全
B、维护社会治安秩序
C、保护公民的合法权益
D、保护公民的合法权益