第17题: [单项选择]The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving (). A. an oil seal B. removing heat C. a gas seal D. cooling the piston 参考答案:C
第26题: [单项选择]下列常见的系统定义的异常中,哪个是数组越界异常 A. ArrayIndexOutOfBoundsException B. IOException C. NullPointerException D. ArithmeticException 参考答案:A 答案解析:[解析] ArrayIndexOutOfBoundsException 为数组越界使用异常;IOException为输入输出错误;NullPointerException为引用为空异常;Arithme