解释水的去离子化。在什么电阻率级别下水被认为已经去离子化?
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()病毒是一种寄生在磁盘引导区计算机病毒,它用病毒的全部或部分取代正常的引导记录,而将正常的引导记录隐藏在磁盘的其他地方。
A. 引导型
B. 文件型
C. 破坏型
D. 传染型
You are creating an error page that provides a user-friendly screen whenever a server exception occurs.You want to hide the stack trace, but you do want to provide the exception’s error message to the user sothe user can provide it to the customer service agent at your company. Which EL code snippet inserts thiserror message into the error page?()
A. Message: ${exception.message}
B. Message: ${exception.errorMessage}
C. Message: ${request.exception.message}
D. Message: ${pageContext.exception.message}
E. Message: ${request.exception.errorMessage}
电动机是一种旋转的电气设备。
A. 正确
B. 错误