志留纪和泥盆纪是最重要的成煤期。()

判断题水星被浓密的大气圈所包围。()

判断题太阳系行星可分为类地和类木两类，前者半径小、密度大，自转速度相对较慢;后者半径大、密度小，自转速度快。()

判断题如果岩石仅发生了重结晶作用，但化学成分与矿物成分均无改变，这种岩石不能称为变质岩。()

判断题大陆漂移说的主要错误是认为上地壳在下地壳之上漂移，但大陆漂移说却是海底扩张说和板块构造理论诞生序曲。()

判断题河流阶地是由河流的侧蚀作用造成的。()

判断题The measure of damages awarded to the innocent party for fraud is the difference between the value of the property as represented and the actual value of the property.()

判断题A voluntary petition is a petition filed by a creditor that states that the debtor has paid his debts.()

判断题If the law requires that a contract be in writing, failure of such a contract to be in writing does not impact its enforcement.()

判断题Preexisting duty promise is unenforceable because of the introduction of a new consideration.()

判断题Minor breach occurs when a party renders substantial performance of his or her contractual duties.()

判断题在执行更新数据库操作时,不能设置输入参数。()

判断题在对象保存时,该对象的类必须被保存。()

判断题对数组进行定义即意味着为其分配内存空间。()

判断题数据库操作必须首先建立与数据源的连接。()

判断题有价证券不属于物。()