伊泰普水电站是巴西和下列哪个国家共同合建的[ ]
A．阿根廷
B．乌拉圭
C．秘鲁
D．巴拉圭
答案：D
—How do you like TV shows Home with kids (家有儿女)?
—I think _______ you turn it on, you'll never be able to turn the TV off. [ ]
A. if
B. because
C. although
D. as
A．电流表的示数为3/11 A
B．通过灯泡的电流的频率为50Hz
C．电流表的示数为3/22 A
D．理想变压器原、副线圈匝数之比为2:1
sin100πt （V）的 正弦交流电源，图中电流表内阻不计．副线圈接入“110V，60W”灯泡一只，且灯光正常发光．下列说法正确的是（ ）
/22 A