民用工程合同书(27)

20　removal of improper work and materials
　　the employer shall during the progress of the works have power to order in writing from time to time，
　　　　（a）the removal from the site， within such time or times as may be specified in the order， of any material which， in the opinion of the employer， are not in accordance with the contract;
　　　　（b）the substitution of proper and suitable materials; and
　　　　（c）the removal and proper reexecution， notwithstanding any previous test thereof or interim payment therefor， of any work which in respect of materials or workmanship is not， in the opinion of the employer， in accordance， with the contract.
　　in case of default on the part of the contractor in carrying out such order， the employer shall be entitled to employ and pay other persons to carry out the same and all expenses consequent thereon or incidental thereto shall be recoverable from the contractor by the employer， or may be deducted by the employer from any monies due or which may become due to the contractor.
21　suspension of work
　　the contractor shall， on the written order of the employer， suspend the progress of the work or any part thereof for such time of times and in such manner as the employer may consider necessary and shall during such suspension properly protect and secure the work， so far as is necessary in the　opinion of the employer. the extra cost incurred by the contractor in giving effect to the employer's instructions under this shall be borne and paid by the employer unless such suspension is;
　　　　（a）otherwise provided for in the contract; or
　　　　（b）necessary by reason of some default on the part of the contractor; or
　　　　（c）necessary by reason of some default on the part of the contractor; or
　　　　（d）necessary for the proper execution of the works or for the safety of the works or any part thereof insofar as such necessity does not arise from any act or default by the engineer or the employer or from any of the expected risks defined in 8（2） hereof.