以下称为国际航线的是()
A.上海一北京一昆明
B.上海一东京一上海
C.东京一横滨一神户
D.A,B,C航线都不是
参考答案:B
如图,是一个有a、b、c三档调温电炉的电路,R1、R2、R3为三段电阻丝.若要在相同的时间内产生的热量最多,则应该旋转开关S接______档.
—Maggie,I really love your handwriting.
—________.
A.I practice every day
B.Thank you very much
C.No,I don’t think so
D.Well,it’s not good enough