I will tell my daughter as soon as she _______ back from work.
A:will come
B:would come
C:comes
D:came
设a→=(1,1,-2),b→=(x,y,z)若x2+y2+z2=16,则a→·b→的最大值为____
如图所示,当开关S断开时,电阻R1、R2是____(填“串联”或“并联”),甲表是____,乙表是____(选填“电流表”或“电压表”)。
如图,在平移三角尺画平行线的过程中,理由是( )
实验是检验化学原理的“最高法庭”.下列化学实验基本操作中正确的是( )