张某将自己的汇票出质给了王某，两人应当签订什么形式的合同（）？ ["口头合同","书面合同","电子合同","法律无规定"]
Which is TRUE concerning immersion suits and their use?（） ["Only a light layer of clothing may be worn underneath","They provide sufficient flotation to do away with the necessity of wearing a life jacket","They should be tight fitting","A puncture in the suit will not appreciably reduce its value"]
李明写了一本书，获得了著作权，他能否将自己的著作权出质给自己的债权人（）？ ["可以","不可以","法律无规定","视情况而定"]
期货交易的阶段包括（）。 ["开仓","买空","卖空","持仓","平仓"]
柳某和邹某是夫妻，在没有特殊约定的情况下，两人对家庭共同财产的所有形式是（）。 ["共同共有","按份共有","柳某单独所有","邹某单独所有"]
什么是热菜？
