Consequently, problems on the legal power of contracts arise such as the time and place of concluding the contract, digital evidence and electronic signature.

二者的统一成立有效的电子商务合同，衍生出电子商务合同成立的时间、地点、数字凭证以及电子签名的法律效力等问题。

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After concluding the Contract of Assignment but before obtaining the Real Estate Certificate of the land-use right of the land, the land user may occupy and use the land but may not dispose of it.

出让合同签订后，土地使用者未取得该宗土地使用权的《房地产证》前，可以占有和使用该宗土地，但不得处分。

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Article 4 in concluding an economic contract, the parties must comply with the laws, administrative rules and regulations.

第四条订立经济合同，必须遵守法律和行政法规。

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