9.supervision for progress:
the supervision personnel appointed by party a and its rep - resentative shall have the authority to supervise the progress or'work and give instruction. party b shall perform correctly in ac - cordance with such instruction given by party a's personnel orrepresentative.
10.stopage work:
should party a notify party b to stop the work for reasonsbeyond the responsibility of party b， party b can stop the workand claim from party a the price of finished work， materials atsite and other reasonable expenses to be added or deducted fromthe paid installments.
11.custody of work:
the completed work and the materials， tools， and equipment at site shall be under the custody of party b after commencement and before completion and delivery of the work. unless in the event of force majeure， party b shall be fully responsible for any damage of the work under the custody of party b. in case of force majeure， party b shall give a list of damage according to the actual condition and suggest an expected price and date forrecovery from such damage to party a for checking and payment.should party a decide not to continue with the work， thiscontract shall be terminated according to article 10 hereof.
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.