3 a buyer who declares the contract avoided in respect of any delivery may , at the same time , declare it avoided in respect of deliveries already made or of future deliveries if , by reason of their interdependence , those deliveries could not be used for the purpose contemplated by the parties at the time of the conclusion of the contract 买方宣告合同对任何一批货物的交付为无效时，可以同时宣告合同对已交付的或今后交付的各批货物均为无效，如果各批货物是互相依存的，不能单独用于双方当事人在订立合同时所设想的目的。
Basis " urban commodity house opens to booking administrative measure " ( 2004 edit ) regulation , commodity house opens to booking ought to accord with the following condition : 1 , already pay is full gold of land access sell one ' s own things , obtain land access letter ; 2 , licence of program of hold construction project and construction permit ; 3 , by offer the commodity house calculation that open to booking , the capital that devoted development builds achieves the 25 % above that project always invests , had fixed construction schedule and complete due date 根据《城市商品房预售治理办法》 （ 2004修订）的规定，商品房预售应当符合以下条件： 1 、已交付全部土地使用权出让金，并取得土地使用权证书； 2 、持有建设工程规划许可证和施工许可证； 3 、按提供预售的商品房计算，投入开发建设的资金达到工程建设总投资的25 %以上，并已经确定了施工进度和竣工交付日期。
Unfolds can carry on has the force majeure to cause this contract to be unable to fulfill , this contract must relieve , has paid to rent the expense expense to have ( date ) like to have the remaining sum according to the actual period of revolution after the solid settlement to return without the rest for the second party , both sides does not undertake opposite party loss compensation 5展会进行中发生不可抗力致使本合同无法履行，本合同应当解除，已交付的租赁费用费用应当按实际使用时间（日）按实结算后如有余额的则无息返还给乙方，双方均不承担对方的损失赔偿。
