一台变比为2的单相变压器，副边接有8Ω的负载；若从原边看，其负_爱下问搜题

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问题单项选择题

一台变比为2的单相变压器，副边接有8Ω的负载；若从原边看，其负载为（）Ω。

A.4

B.8

C.16

D.32

答案

参考答案：A

选择题

一 I _____ to your birthday party last Sunday.

一 Unfortunately, you were out on business. [ ]

A. had come

B. came

C. would come

D. would have come

单项选择题

男性，39岁。反复出现上腹部烧灼感伴反酸1年，近半个月来加重并出现恶心呕吐等症状，胃镜检查发现胃窦部溃疡，十二指肠壶腹变形。最可能的诊断

A．胃多发溃疡

B．幽门管溃疡

C．十二指肠溃疡

D．复合性溃疡

E．难治性溃疡