颈椎张口位摄影，中心线经：() A．上颌切牙咬合面中点 B．下颌_爱下问搜题

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问题单项选择题

颈椎张口位摄影，中心线经：()

A．上颌切牙咬合面中点

B．下颌切牙咬合面中点

C．上颌磨牙咬合面中点

D．下颌磨牙咬合面中点

E．上颌尖牙咬合面中点

答案

参考答案：A

选择题

Many people are worried about the pollution in big cities and rainforest [ ]

A. disappear

B. disappeared

C. disappearing

选择题

The young man _____ is a friend of mine. [ ]

A. who I had a talk

B. whom I had a talk with

C. which I had a talk with

D. whom I had a talk