A: 关节软骨和韧带
B:关节头和关节窝
C:关节软骨和滑液
D:关节腔和滑液
37-7=____
17-7=____
如图所示实验装置,弹簧测力计下面挂着条形铁块,螺线管中插有铁芯.现开关S拨在触点②位置且电流表示数为I.要使弹簧测力计的示数变大,下列操作方法能够实现的是
应用乘法运算定律把8.5×10.1改写成( )式计算简便
下列说法正确的是( )
根据首字母提示完成下列短文。
A good class monitor gets on well w____ classmates and likes to h____ others. He often cleans the classroom and makes the classroom c____ just like h____. C____ him to be your monitor.