A:动脉
B:静脉
C:毛细血管
D:不确定
-- _______ the Internet ___________ in your school?
-- Yes, but the computer in our office has broken down.
春秋战国时期,各学派纷纷著书立说,形成了“百家争鸣”的学术繁荣局面。其中墨家学派创始人墨子的主张是 ( )