单项选择题
下列关于流体在换热器中走管程或走壳程的安排中不一定妥当的（ ）
判断题 道钉是混凝土枕的常用扣件。正确错误
单项选择题 Xunzi's epistemology can be regarded as primitive materialist empiricism.A.对B.错
单项选择题 I had no idea of the machine _______ already. A、to test B、having been tested C、testing D、having tested
