The new company increased the number of telephone switchboards and introduced the use of electronic switches in-stead of manual operators. Later in the 20th century as cables were laid across the ocean floor, this made communication with different continents possible, it was very expensive for people in the rural areas of the west to set up phone service though. In order to lower the prices of the telephone services, the United States government forced the telephone company to allow local telephone companies to offer competing services. When the private "baby bells" were allowed to operate, the prices of telephone service fell dramatically.
Where was the first telephone service in America established?
A.New York.
B.Washington D.C.
C.Philadelphia.
D.Chicago.
第1题
关于骨髓增生异常综合征(MDS)正确的是
A、细胞形态有病态造血改变可诊断MDS
B、出现环形铁粒幼红细胞,即可诊断MDS (RARS型)
C、骨髓中原始粒细胞>24%,可诊断MDS (RAEB-T型)
D、RAEB-T型MDS可作为早期白血病对待
E、贫血时间较长可诊断为MDS
第2题
A.细胞形态有病态造血改变可诊断MDS
B.出现环形铁粒幼红细胞,即可诊断MDS(RARS型)
C.骨髓中原始粒细胞>24%,可诊断MDS(RAEB-T型)
D.RAEB—T型MDS可作为早期白血病对待
E.贫血时间较长可诊断为MDS
第3题
下列哪项对骨髓增生异常综合征(MDS)是正确的
A.见到病态造血就可诊断MDS
B.出现环形铁粒幼红细胞,即可诊断MDS(RARS型)
C.骨髓中原始粒细胞>24%,可诊断MDS(RAEB-T型)
D.RAEB-T型MDS可作为早期白血病对待
E.RAEB-T型MDS不作为早期白血病对待
第4题
不符合骨髓增生异常综合征(MDS)病态造血表现的是
A、出现环形铁粒幼细胞
B、粒系核畸形伴成熟障碍
C、红系巨幼样变
D、可见小巨核细胞
E、骨髓增生极度活跃
第5题
A.细胞形态有病态造血改变可诊断MDS
B.出现环形铁粒幼红细胞,即可诊断MDS(RARS型)
C.骨髓中原始粒细胞>20%,可诊断MDS(RAEB_T型)
D.RAEB-T型MDS可作为早期白血病对待
E.贫血时间较长可诊断为MDS
第6题
A.细胞形态有病态造血改变可诊断MDS
B.出现环形铁粒幼红细胞,即可诊断MDS(RARS型)
C.骨髓中原始粒细胞>20%,可诊断MDS(RAEB-T型)
D.RAEB-T型MDS可作为早期白血病对待
E.贫血时间较长可诊断为MDS
第8题
A.见到病态造血就可诊断MDS
B.出现环形铁粒幼红细胞,即可诊断MDS(RARS型)
C.骨髓中原始粒细胞>24%,可诊断MDS(RAEB-T型)
D.RAEB-T型MDS可作为早期白血病对待
E.RAEB-T型MDS不作为早期白血病对待
第9题
下列关于病态造血的描述错误的是
A.病态造血只在骨髓增生异常综合征中出现
B.病态造血是诊断骨髓增生异常综合征的关键
C.在红白血病中红系可出现病态造血
D.骨髓增生异常综合征时病态造血可累及三系
E.病态造血很少见于良性疾病
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