支气管肺癌常见的早期症状是
A.声音嘶哑B.胸痛C.气促D.呛咳E.发热
参考答案:D
变压器中初级绕组和次级绕组绕在同一铁心上的目的是().
A、减小磁滞损耗
B、减小涡流损耗
C、减小漏磁损失
D、减小绕组的铜损
Mary did do some bad things about me, but I have ________ her for that.[ ]
A.regretted
B.freed
C.relaxed
D.forgiven