DDR内存缺口为()个 ["1","2","3","没有"]
下列分类属于计量量具的是()。 ["A、压力表、砝码","B、量块、刻度尺","C、量块、天平","D、压力表、天平"]
液压系统在启动前,所有操纵杆都应处于()。 ["A、固定位置","B、工作位置","C、中间位置","D、相应位置"]
内存类型是DDR400,内存工作频率是()GB/S ["1.6","2.1","2.7","3.2"]
计量仪器是指将被测量值转化为可直接观察的示值或()的计量器具。 ["A、数字","B、信息","C、可操作","D、等效信息"]
树脂的“老化”