If you used longs heavily in GWT 1.4 and speed is more important than the numeric range, consider switching those variables to 'int' or 'double' to maintain the same speed as GWT 1.4.

So, switching the area, moving the area to the other side, I'll get double integral of xdA is the area of origin times the x coordinate of the center of mass.

Switching valve division has been using the double pump patented corrosion resistant ceramic leakproof structure to ensure that fluid does not leak slurry drops.