关于对比剂的叙述，错误的是（） A.分阴性和阳性对比剂两类 B._爱下问搜题

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问题单项选择题

关于对比剂的叙述，错误的是（）

A.分阴性和阳性对比剂两类

B.可显示组织器官的形态

C.非离子型对比剂属于盐类物质

D.非离子型对比剂毒性较小

E.与周围器官能形成密度差别

答案

参考答案：C

单项选择题 B型题

青少年特发性脊柱侧弯（）

A.踝足矫形器

B.膝踝足定矫形器

C.截瘫行走器

D.脊柱侧弯矫形器

E.腰围

单项选择题

It may be necessary, in order that .future (51) can enjoy clean air, that more of the (52) is borne by long-term central government fund．As air pollution varies enormously from place to place and can, indeed, be very local, it may also be necessary for the central government to (53) money so that local authorities can (54) special local problems. That these can be significant was shown by the report made in 1970 (55) behalf of the London Boroughs Association. This (56) that in central London since 1958 smoke concentrations have decreased by 80 percent, whereas sunshine has increased by 70 percent and winter visibility has (57) threefold, There have been (58) in mortality and hospital admissions (59) with air pollution and in the response to it of bronchitis, as well as clear if less documented increases in plant types and bird (60) n the cities.

A．in

B．at

C．on

D．to