[名词解释] 商标权

关系模型中，一个关键字是（） ["只能由一个属性组成","可由一个或多个其值能唯一标识该关系模式中任何元组的属性组成","可由多个任意属性组成","以上都不是"] 凡开、闭时冒出煤气的隔断装置盲板、眼睛阀或扇型阀及敞开式插板阀等，不应安装在厂房内或通风不良之处，离明火设备距离不少于（）m。 ["10","20","40"] You need to write a code segment that transfers the first 80 bytes from a stream variable named stream1 into a new byte array named byteArray. You also need to ensure that the code segment assigns the number of bytes that are transferred to an integer variable named bytesTransferred. Which code segment should you use?（） ["bytesTransferred=stream1.Read（byteArray，0，80）；","","",""] 下列哪种情形合同无效（） ["恶意串通，损害国家、集体或者第三人利益","以合法形式掩盖非法目的","损害社会公共利益","违反法律、行政法规的强制性规定"] 如果一个班只能有一个班长，而且一个班长不能同时担任其他班的班长，班级和班长两个实体之间的关系属于（）。 ["一对一联系","一对二联系","多对多联系","一对多联系"] 商标权