心脏长轴位主要用于观察
A．左心室收缩期和舒张期的径线改变
B．二尖瓣的功能
C．右心房、右心室
D．上、下腔静脉
E．评估心室功能
参考答案：A,B,C,D
解析： 长轴位定位根据横轴位断面上“四腔心”层面，扫描轴线平行于左心室长轴及室间隔，此层面主要用于观察左心室长轴收缩期和舒张期的径线改变及二尖瓣功能，同时可良好显示右心房和上、下腔静脉，亦可观察右心室流入道、流出道和三尖瓣关闭不全的情况。
| 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．improved
B．shared
C．added
D．proved