下列属于所有权绝对消灭的是（）。
A. 所有权客体的消灭
B. 所有权的抛弃
C. 所有权转让
D. 所有权因强制手段被转移
Click the Exhibit button. Which statement is true about the classes and interfaces in the exhibit？（）
A. Compilation will succeed for all classes and interfaces.
B. Compilation of class C will fail because of an error in line 2.
Compilation of class C will fail because of an error in line 6.
D. Compilation of class AImpl will fail because of an error in line 2.
ClicktheExhibitbuttonandexaminethedatafromtheEMPtable. TheCOMMISSIONcolumnshowsthemonthlycommissionearnedbytheemployee. Whichthreetaskswouldrequiresubqueriesorjoinsinordertobeperformedinasinglestep?（）
A. deletingtherecordsofemployeeswhodonotearncommission
B. increasingthecommissionofemployee3bytheaveragecommissionearnedindepartment20
C. findingthenumberofemployeeswhodoNOTearncommissionandareworkingfordepartment20
D. insertingintothetableanewemployee10whoworksfordepartment20andearnsacommissionthatisequaltothecommissionearnedbyemployee3
E. creatingatablecalledCOMMISSIONthathasthesamestructureanddataasthecolumnsEMP_IDandCOMMISSIONoftheEMPtable
F. decreasingthecommissionby150fortheemployeeswhoareworkingindepartment30andearningacommissionofmorethan800
蓄电池放电终了的特征是（）
A. 单格电压下降到终止电压1、75V
B. 不再有电
C. 电解液密度降到1、10g/cm
D. 蓄电池不能继续使用
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