变压器铁心的结构有芯式和()。
A.同心式
B.交叠式
C.T式
D.壳式
参考答案:D
There are many things that I can't _____ going abroad,of which is the ignorance of the locals.[ ]
A. keep up with
B. come up with
C. put up with
D. catch up with
诊断羊水栓塞的依据为()
A.出现呼吸困难,发绀
B.心电图示右心房、右心室扩大
C.下腔静脉血镜检到羊水成分
D.凝血功能异常
E.胸部X线片双肺有阴影