I have__ rules in my home. We have__ homework to do today. A. too many, too much B. too much, too many C. too many, much too D. much too, many too
指出下列条件组中，p是q的什么条件？并说明理由，（1）p:a,b都是偶数，q:a+b是偶数；（2）p:x∈A∪B，q:x∈A且x∈B;（3）p:△ABC是锐角三角形，q:△A
如图9-27所示，abcd区域里有一匀强磁场，现有一竖直的圆环，使它匀速下落，在下落过程中，它的左半部通过水平方向的磁场.O是圆环的圆心，AB是圆环
下列叙述正确的是( ) A．CH4O和C2H6O一定互为同系物 B．16 g CH4与18 g NH4＋所含质子数相等 C．32S与33S的核外电子数相等，是同一种核素 D．质量
某种细菌在培养过程中，每半小时分裂一次（由一个分裂为两个）．若这种细菌由1个分裂为64个，那么这个过程要经过（ ） A．1小时 B．2小
36. I went to meet him at the airport but I_________. A.didn’t B.failed C.can’t D.lost
The novel ______ by many people today. A. is read B. are read C.reads D. were read
的平方根是_