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【单选题】
女孩,3岁。出生时接种过卡介苗,2岁半时PPD试验硬结直径6mm,最近PPD试验硬结直径为18mm。其最可能是A.
阴性反应
B.
卡介苗接种后反应
C.
新近有结核感染
D.
假阳性反应
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举一反三
【单选题】Which of the following statements is tree, according to the author of this passage?
A.
Certification is very common so you need to get certified, too.
B.
Certification is needed in a wide variety of fields, so may be in yours.
C.
Certification is varied because of more emerging careers and areas.
D.
Certification is becoming more and more important for every one.
【单选题】以下对TCP和UDP协议区别的描述,哪个是正确的()
A.
UDP用于帮助IP确保数据传输,而TCP无法实现
B.
UDP提供了一种传输不可靠的服务,主要用于可靠性高的局域网中,TCP的功能与之相反
C.
TCP提供了一种传输不可靠的服务,主要用于可靠性高的局域网中,UDP的功能与之相反
D.
以上说法都错误
【单选题】Which of the following statements is true, according to the author of this passage?
A.
Certification is very common so you need to get certified, too.
B.
Certification is needed in a wide variety of fields, so may be in yours.
C.
Certification is varied because of more emerging careers and areas.
D.
Certification is becoming more and more important for every one.
【简答题】高炉煤气的化学成分中的可燃性成分主要有：CO、H2和微量的__________ ，所以高炉煤气是较好的气体燃料。
【简答题】气门间隙过小可能导致
【单选题】The Owners guarantee that the Vessel to be at all times _______ valid and up-to-date certificates to comply with such regulations in every respect．
A.
in stead of
B.
in lieu of
C.
in possession of
D.
in place of
【单选题】汉译英：“产地证书、兽医证书、熏蒸证书”。( )
A.
Certificate of Origin Veterinary Certi6cate Fumigation Certificate
B.
Certificate if Origin Certificate of Health Disinfection Certificate
C.
Certificate of Origin Sanitary Certificate Fumigation Certificate
D.
Certificate of Origin Veterinary Health Certificate Fumigation Certificate
【单选题】What is NOT required on an uninspected towing vessel?
A.
Certificate of Documentation
B.
Certificate of Inspection
C.
Operators Merchant Marine license
D.
FCC Station License
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