【单选题】以下列材料分别组成相同规格的四个磁路,磁阻最大的材料是( )。
【单选题】— Wow! It snowed last night. What a nice world! — You're right. But it's more difficult to find my missing keys with snow________ the ground. [ ]
【单选题】式中 TP为真阳性,FN为假阴性,TN为真阴性,FP为假阳性, 式中符号意义同上,诊断敏感性计算公式为:
【简答题】接上题,若我们将真阳性记为TP,假阳性为FP,真阴性为TN,假阴性为FN,计算特异度的公式为:Specificity= [ ]/(TN+FP),请问“[ ]”中应填?
【判断题】变压器铁心中的主磁通最大值φm的大小仅由电源电压、频率及原级匝数确定,与磁路的磁阻无关。( )
【单选题】拜金主义是一种认为金钱可以主宰一切,把追求金钱作为人生至高目的的思想观念,这种观念是正确的。( )
【简答题】Let's start at the very beginning A very good place to start When you read you begin with A-B-C When you sing you begin with do-re-mi Do-re-mi Do-re-mi The first three notes just happen to be Do-re-mi...
【单选题】在相同条件的情况下,其磁阻最大的材料是()。