经纬仪视准轴检验和校正的目的是()。
A.使视准轴垂直横轴
B.使横轴垂直于竖轴
C.使视准轴平行于水准轴
D.以上都不对
参考答案:A
Tom asked me .
A.if he can use my computer
B.whether he can use my computer
C.that he could use my computer
D.if he could use my computer
口服胆囊造影宜选择下述哪种对比剂()
A.碘化油
B.碘番酸
C.碘苯酯
D.碘卡明
E.碘化钠