| 摘要 |
<p>The ratio (first value v) of the area forming a first exposed surface (12b) to the area of a first principal surface A is smaller than the ratio (second value w) of the area forming a second exposed surface (13b) to the area of a second principal surface B. Furthermore, the ratio of the first value v to the second value w is smaller than the ratio of a third value x to a fourth value y, wherein the third value x is the ratio of the area forming a first connection portion (12a) to the area of a region C, and the fourth value y is the ratio of the area forming a second connection portion (13a) to the area of a region D.</p> |
