A:13
B:12
C:10
D:5
—________was George Washington?
—He was the first president of the USA.
欲将粗盐提纯并用所得精盐配制一定质量分数的氯化钠溶液。下列说法正确的是
如图所示电路中,电压表测的是____(填“L1”、“L2”或“电源“)两端的电压.若电源电压为6V,电压表的示数为2V,则灯泡L1两端的电压为____V,L2两端的电压为____V.