A:so
B:and
C:yet
D:but
Most students would like to the English Club. They want to improve their English.
— Shall we watch Japanese cartoons?
— Japanese cartoons are not my cup of tea. I watch talk shows.
①接触面所受的压力大小;
②接触面的粗糙程度;
③接触面积的大小.
通过如图所示实验操作验证这些猜想: