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问题 单项选择题

根尖片投照的分角技术是指

A．X线与被检查牙齿的长轴垂直

B．X线与胶片垂直

C．X线与被检查牙齿的长轴及胶片之间的分角线垂直

D．X线与被检查牙齿的长轴和胶片之间的分角线平行

E．X线与咬合平面平行

答案

参考答案：C

填空题

智力的核心成分是______，智力的高级表现是______。
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单项选择题

Which of the following statements regarding a bond being called is TRUE Call prices are known as regular redemption prices when bonds are called at:（）

A. under the call provisions specified in the bond indenture.

B. at a discount.

C. at a premium.
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