胃热呕吐宜选用的炮制规格是()
A.黄连
B.酒黄连
C.姜黄连
D.萸黄连
E.黄连炭
参考答案:C
现有电源、电流表、电压表、开关、滑动变阻器各一个,要测量额定电压为3.8V小灯泡的额定功率:
(1)请连接好实物图:
(2)根据实物图,实验前滑动变阻器滑片P应放置在______端.
(3)实验时电压表应调到______ V.
(4)若电流表示数如图所示,则小灯泡的额定功率为______.
(5)若电压调到4V时,小灯泡的实际功率为______.
—Daming, __________no milk and eggs in the fridge.
—Oh, I’ll go and buy some soon. [ ]
A. it is
B. they are
C. there is
D. there are