口服胆囊造影选用()
静脉尿路造影选用()
脊髓造影选用()

A．碘化油

B．碘番酸

C．碘苯酯

D．泛影葡胺

E．胆影葡胺

If the ratio of men to women employed by Company S in 1975 was , what is the ratio of men to women employed by Company S in 1976 ？（）

(1)Company S employed 20 more women in 1976 than in 1975.

(2)Company S employed 20 more men in 1976 than in 1975.

A.条件（1）充分，但条件（2）不充分.

B.条件（2）充分，但条件（1）不充分.

C.条件（1）和（2）单独都不充分，但条件（1）和条件（2）联合起来充分.

D.条件（1）充分，条件（2）也充分.

E.条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.