拔牙后原发性出血的局部因素有（） A.牙龈撕裂未处理 B.牙槽_爱下问搜题

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问题多项选择题

拔牙后原发性出血的局部因素有（）

A.牙龈撕裂未处理

B.牙槽窝内残留炎性肉芽组织

C.牙槽小血管破裂

D.牙槽突骨折

E.创口感染

答案

参考答案：A, B, C, D

多项选择题

我国现行股票按照投资主体不同，可以分为：（）

A、国家股

B、法人股

C、公众股

D、外资股

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．allocate

B．assign

C．amass

D．attract