—I have no idea ____________ tell her the bad news. —I think tomorrow is the best time.
A:how to
B:when to
C:how
D:when
在测量小灯泡电功率的实验中,电源电压为4.5V,小灯泡的额定电压为2.5V,小灯泡正常发光时的电阻约为10Ω.
岭____ 侧____ 峰____ 腊____ 柳____
铃____ 测____ 锋____ 惜____ 抑____
下列哪项是植物生长需要量最多的无机盐( )