的终边落在（ ） A．第一象限 B．第二象限 C．第三象限 D．第四象限
铝元素的原子结构示意图如右图，最外层上的电子数是 A．2 B．3 C．8 D．13
北宋时期，并称“二府”的是 A．三省长官和枢密院 B．中书门下和枢密院 C．三司使和枢密使
Are you looking for some new and exciting places to take your kids to? Try some of these places: ●Visit art museums. They offer a variety of activities to excite your kids' interest. Many offer w
I’m sorry, I didn’t _______ you clearly. Would you say it again? A. hear B. notice C. see
The government realized that 61 (wear) masks had become a problem. Their use was limited by laws, the first of 62 dates back to the fourteenth century. Men were not allowed to dres
____more and more people may refer to the Internet fo up-to-date news,it is unlikely that the newspaper will disappear. A.While B.When C.As
参与研制中国第一颗原子弹的物理学家周光召曾说：“没有……就不可能有半导体、集成电路、激光器和信息科学。”“……”可能是指 A．相对论
