听力原文:W: John, have a look at this note from the landlord?
M: What? It's too much for us. We can't afford another twenty dollars a month.
What are the speakers talking about?
A.a salary cut.
B.A house.
C.A rent increase.
D.A vacation trip.
第4题
A、机架转轴和准直器转轴的交点
B、机架转轴和治疗床转轴的交点
C、机架转轴,准直器,和治疗床转轴的交点
D、机架转轴和射野中心轴的交点
E、机架转轴的中心
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