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【判断题】
程序员必须创建System.in，System.out和System.err对象。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】气态中性原子失去一个电子转化为气态正离子所需要的最低能量叫做第一电离能 ( I 1 ) ,气态正离子继续失去电子所需最低能量依次称为第二电离能 ( I 2 ) 、第三电离能 ( I 3 ) ......下表是第 3 周期部分元素的电离能 [ 单位: eV( 电子伏特 )] 数据。 元素 I 1 /eV I 2 /eV I 3 /eV 甲 5.7 47.4 [来源:Zxxk.Com] 71.8 乙 ...
A.
甲的金属性比乙弱
B.
乙的化合价为＋ 1 价
C.
丙一定为非金属元素
D.
D ．丁一定是金属元素
【单选题】Who won the World Cup 1998 football game? What happened at the United Nations? How did the critics like the new play?【C1】______ an event takes place, newspapers are on the streets giving the details. ...
A.
Just when
B.
While
C.
Soon after
D.
Before
【单选题】Who won the World Cup 2006 football game? What happened at the United Nations? How did the critics like the new play?【B1】an event takes place, newspapers are on the streets giving the details. Whereve...
A.
Just when
B.
While
C.
Soon after
D.
Before
【单选题】Who won the World Cup 1998 football game? What happened at the United Nations? How did the critics like the new play?【C1】______ an event takes place, newspapers are on the streets giving the details. ...
A.
Just when
B.
While
C.
Soon after
D.
Before
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