ABSTRACT
There are some defects in checkiM holes program which is used in manifold design. For example. SOIDP. program can onlY check holes which are parallel or perpendicular to the faces of manifold!ll, others simplify ~one as column or ball in the mathematical model of checking hoi~ programr2l. All this could not decide whether the holes connection satisfied our demanded desi~m. These defects would C'lluse faults or failures in hvdraulic system design and manufacture.
