经纬仪测角中，其操作步骤之一是调节()使十字丝分别清晰。
A. 目镜
B. 物镜
C. 对光螺旋
D. 反光镜
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The key of the reduction of salt intake is__________．
A. salt is all inerrant flavor enhancer and preservative
B. salt is an essential nutrient for the body
C. the businessmen worry they will get less profit
D. there are some other important factors for high blood pressure
国家规定的核医学科唯一强制检定的核医学仪器为()
A. SPECT
B. γ照相机
C. 肾图仪
D. 活度计
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