【单选题】在下面空格中选择填入的数学符号 “= , ≥ , ≤ , >” 或 “<” H(XY) H(Y)+H(X)
【简答题】在下面空格中选择填入的数学符号 “= , ≥ , ≤ , >” 或 “ H(XY) H(Y)+H(X)
【单选题】下列选项中,能够使sqlite数据库的SqliteOpenHelper类自动调用它onUpgrade()方法的操作是( )。
A.
在每次新建DatabaseHelper对象时
B.
用DatabaseHelper调用getReadableDatabase()方法时
C.
在每次调用SqliteDatabase的getWritableDatabase()方法时
D.
当创建DatabaseHelper对象时,数据库版本参数发生变化时
【单选题】There is egg on the table, egg is for you.
【单选题】According to the text, 'rational choice' holds that
A.
decision making is not linked with wisdom in a sense.
B.
happiness relies on short-term individual gains.
C.
individual happiness harms the broad interests of society.
D.
individual fates change with reckless greed.