【单选题】Tomorrow is Dragon Boat Day, so my mother and my grandma __ a big meal for our family in the kitchen.
【单选题】. Can you see the tree _____ we tied our boat last time?
【单选题】下列哪一国家不属于古代东方的四大文明古国()
【简答题】-The Dragon Boat races are so exciting, but our boat is still behind.- -Don't worry. I am sure ___our team will win!A. if B. / C. whether D. of
【单选题】There is a fishing boat in front of our ship.()
【单选题】关于电磁感应现象,下列说法中正确的是( )
A.
闭合线圈放在变化的磁场中,必然有感应电流产生
B.
闭合正方形线圈在匀强磁场中垂直磁感线运动,必然产生感应电流
C.
穿过闭合线圈的磁通量变化时,线圈中有感应电流
D.
只要穿过电路的磁通量发生变化,电路中就一定有感应电流产生
【单选题】Our boat was surrounded by a large _________ of dolphins.
【单选题】关于电磁感应现象,下列说法中正确的是 ( )
A.
闭合线圈放在变化的磁场中,必然有感应电流产生
B.
闭合正方形线框在匀强磁场中垂直磁感线运动,必然产生感应电流
C.
穿过闭合线圈的磁通量变化时,线圈中有感应电流
D.
只要穿过电路的磁通量发生变化,电路中就一定有感应电流产生