单项选择题 The owners of the S.S. Short Haul agree to a charter with the Longsplice Steamship Company. The owners stipulate in the charter party that the regular Master must be employed as the vessel’s Master for the entire life of the contract. Which charter has be （）.

单项选择题 The importance of the distinction between a charter by demise and a charter party proper （）that under the former the master is the agent of the Charterer，not of the Shipowner.

单项选择题 The fact that it has become more onerous or more expensive for one party than he thought （）sufficient to bring about a frustration.