Henry has come in his raincoat and gumboots ,_____for rain.

磁感应强度$B=\frac{F}{IL}$，是用比值定义法的，与下列哪个物理量的表达式是不相同的物理方法(    )

读下面这首词回答后边的题。
                                                                                                      西江月（辛弃疾）
                                                                    明月别枝惊鹊，清风半夜鸣蝉。稻花香里说丰年，听取蛙声一片。
                                                                   七八个星天外，两三点雨山前。旧时茅店社林边，路转溪桥忽见。