Li Lei usually gets up _____than I.[ ]
A. early
B. earliest
C. the earliest
D. earlier
答案:D
当a<0时,求抛物线y=x2+2ax+1+2a2的顶点所在的象限.
K1-NT触摸屏失灵故障,与以下哪些器件有关()
A.U2100(加速度传感器)
B.J1801连接器
C.U3000(RF收发器)
D.U100(通信处理器)