题型:判断题 Without facts,we cannot form a worthwhile opinion,for we need to have factual knowledge ______ our thinking.A.upon which to baseB.which to be based onC.which to base onD.to which to be based on 查看答案
题型:判断题 HDY-2000逆变式恒电位仪,开机操作中调节电位器时阴极电位开始增大,当将阴极电位调到设计要求的参数时,阴极电位的正常范围是()。A.0.5V~1.5VB.0.25V~1.0VC.0.85V~1.5VD.1.0V~1.5V 查看答案