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【单选题】
类Teacher和Student都是类Person的子类,t、S、p分别是上述三个类的非空引用变量,关于以下语句说法正确的( )。 if(t instanceof Person) { S= (Student)t; }A.
将构造一个Student对象
B.
表达式合法
C.
编译时非法
D.
编译时合法而在运行时可能非法
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【单选题】“只能在狭水道或航道内安全航行的船舶”是指__。
A.
船长大于20米的机动船
B.
深吃水船
C.
由于水深受限,致使其转向能力严重受限的机动船
D.
由于可航水域宽度受限,致使其转向能力严重受到限制的船舶
【判断题】我不挑食,什么饭都吃。 .مەن زادىلا تاماق تاللىمايمەن، مەيلى ھەرقانداق تاماق بولسۇن يەمەيۋېرىمەن
A.
正确
B.
错误
【简答题】Thousands of villages in the developing world have no telephones. They have no money to build telephone systems. A new kind of technology may help change this situation. I t reduces the cost of buildi...
【判断题】If the differences of the goods fall within the scope of quality tolerance, the buyer shall have no right to reject them or ask for adjusting the price.
A.
正确
B.
错误
【简答题】A．Both the man and the woman have no time to look at the gift. B．The man can't imagine what his friends get for him. C．The man already knows what Betty will say. D．The man is anxious to see Betty's re...
【简答题】A．The poor are unemployed. B．All the poor have no land. C．The poor have no houses in big cities. D．There is no hope for the poor in the village.
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