根据小磁针的指向和磁感线的方向判断,如图所示,在四幅图中错误的是()
A:
B:
C:
D:
已知x1,x2是一元二次方程x2-4x+1=0的两个实数根,则x1x2-x1-x2的值等于( )
⑴____ tall talk
⑵____ small smell
⑶____ ball tall
⑷____ wait salt
When you feel helpless and _______, just remember you are not _____ in the world because your friends are around you, including me.