12. warranty for work.
party b shall warrant the promised condition of the work within _________ year（s） after the date of receiving the work by party a. however，party b shall not be liable to acts of god or misuse of the work by party a.
13. supplemental provisions:
party b shall be held responsible if party a's personnel or other people is injured due to the negligence of party b duringthe progress of construction. however，such responsibility shallrest upon party a if the injury caused is due to the negligence of party a of technicians contracted with party a.
14. attachments :
attachments shall become an integral part of this contractand shall be as effective as any other provisions. attachments include: （1） drawings，（2） an estimate of cost.
15. format of this contract:
the contract shall be in duplicate with two texts to be heldseparately by the parties hereof. each of the parties shall alsokeep two copies of the contract for record.
16. additional provision :
maintenace of main engine.
party b shall provide free periodic maintenance service forthe main engine of _________ for _________ year（s） after the receiving of the work by party a and send maintenance personnel every _________month（s） for performing maintenance.
this contract has been executed by the parties as of the day and year first above written.
party a:_________party b:_________
by:_________by:_________
address:_________address:_________
date:_________date:_________
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