关于炼金炸弹的射程增量计算问题

[软软软]

首先，PF对泼溅武器的规则是
　
如果你的投炸武器攻击失手（无论是对生物还是对落地点方格），那么你需要骰1d8以决定投炸武器误落的地点。投骰为1意味着你的攻击将偏远（原目标与你的直线且远离你的方向），投骰为2到8则落在顺时针环绕的另外方向。然后在该方向上延伸相当于投炸武器射程增量的距离，决定它的最终落点。你的投炸武器会对误落点邻接方格内的全部生物造成影响。

劇透 -   :

If you miss the target (whether aiming at a creature or a grid intersection), roll 1d8. This determines the misdirection of the throw, with 1 falling short (off-target in a straight line toward the thrower), and 2 through 8 rotating around the target creature or grid intersection in a clockwise direction. Then, count a number of squares in the indicated direction equal to the range increment of the throw. After you determine where the weapon landed, it deals splash damage to all creatures in that square and in all adjacent squares.

然后，对炼金炸弹的描述是：

　制作并投掷炼金炸弹是一个标准动作并且会导致借机攻击，投掷炼金炸弹有着20尺的距离，而且使用投掷溅射武器的特殊攻击规则。炼金炸弹被视为一件武器，并可以选择用专长来使用它，比如「近距射击」和「武器专攻」。

劇透 -   :

Drawing the components of, creating, and throwing a bomb requires a standard action that provokes an attack of opportunity. Thrown bombs have a range of 20 feet and use the Throw Splash Weapon special attack.

那么第一个问题是，炼金炸弹的射程增量是多少？

第二个问题是，如果使用了炸弹轰炸科研发现，那么射程增量又是多少？
　　

劇透 -   :

炸弹轰炸（Strafe Bomb, Su）：炼金术师用炸弹轰炸40尺直线上的目标而不是产生影响半径。这条线从炼金术师的脚边开始并朝着他指定的方向延伸，炼金术师选择路径上的一个生物对其投掷攻击骰，并使他受到全额伤害，路径上的其他生物则受到泼溅伤害。如果炼金术师有学习过「高爆炸弹」的科研发现，可以使用「高爆炸弹」轰炸80尺距离中的生物取代40尺。

劇透 -   :

Strafe Bomb (Su): The alchemist can throw bombs that splash in a 40-foot line rather than affecting a radius. The line starts at the alchemist and extends away from him in the direction he chooses. The alchemist designates one creature in the squares affected by the line to be the target of the bomb and makes his attack roll against that creature; all other squares in the line take splash damage. If the alchemist has the explosive bomb discovery and throws an explosive strafe bomb, the line of splash damage is 80 feet long instead of 40 feet.