[单项选择]含碳量小于0.25%的钢是( )。 A. 低碳钢 B. 高碳钢 C. 中碳钢 D. 碳素钢丝
参考答案:A
热门试题:
第1题: [简答题]1. 书本知识和实践经验哪一类更重要 2．我的理由。 参考答案: Not Everything That Is Learned Is Contained in Books Would you want a doctor to operate on you who has only learned about operations from a textbook Would you want a dentist to drill your tooth who has never before done so The answer to these questions is obviously“no"．Knowledge gained from books must always be complemented by knowledge gained from actual experience，to be of real value．Of the two，the latter is certainly more important．The reasons are as follows： The first and most important reason is that knowledge from books is theoretical knowledge， while that gained from experience is applied knowledge．In any field of endeavor，actual experience is a must to fully understand how to do something，whether it be driving，teaching or cooking. The second reason why knowledge gained from experience is more important than book knowledge is that all new inventions and all creative endeavors do not come from books，but from experiments and experience．In other words，the knowledge contained in books is old knowledge． In conclusion，while knowledge gained from books is important，and can lay a basic foundation for learning，it is our actual experience which enables us to really learn how to do something，how to face and resolve the inevitable issues that come up which were not covered in the books．
第2题: [单项选择]空间分辨力的计算式是（） A. D=lgI0/I B. K=D1-D2 C. K=rlgKx D. S=H/K E. R=1/2d 参考答案:E
第3题: [单项选择]项目的效果和效益评价，一般有五个方面，它们是( )。 A. 技术、经济、环境、社会和管理 B. 技术、经济、环境、社会和发展 C. 技术、财务、经济、社会和管理 D. 技术、财务、环境、社会和发展 参考答案:A
第12题: [多项选择]设备监理机构组织设计的依据有( )。 A. 设备监理机构建立的程序 B. 类似任务资料 C. 项目内在联系 D. 组织和人员管理惯例 E. 制约和限制 参考答案:A,C,D 答案解析:[解析] 设备监理机构组织设计的依据是指在特定环境下建立项目组织的要求和条件。包括设备监理机构建立的程序、项目内在联系、制约和限制。
第16题: [单项选择]在GB/T14394计算机软件可靠性和可维护性管理标准中，（）不是详细设计评审的内容。 A. 各单元可靠性和可维护性目标 B. 可靠性和可维护性设计 C. 测试文件、软件开发工具 D. 测试原理、要求、文件和工具 参考答案:D 答案解析:在GB/T14394计算机软件可靠性和可维护性管理标准中，详细设计评审的内容分别为：·各单元可靠性和可维护性目标；·可靠性和可维护性设计（如容错）；·测试文件；·软件开发工具。而测试原理、要求、文件和
