Can you teach me how dumplings?
A:make
B:to make
C:made
D:making
一小磁针放在通电螺线管周围,静止时N极指向如图所示.请用箭头标出磁感应的方向,并用“+”、“﹣”符合在括号内标出电源正、负极.
某同学近年来皮肤干燥,夜晚看东西眼涩,他应该补充( )