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【单选题】
四显示自动闭塞区段连续式机车信号机中什么色灯表示不复示地面信号?
A.
绿灯
B.
C.
无显示
D.
黄灯
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【单选题】船上自然通风系统的原理是( ):I、有船速时才能达到通风;II、无风,无船速时不能达到通风;III、相对船有空气流动即可通风
A.
I、II
B.
II、III
C.
I、III
D.
仅III
【单选题】船上自然通风系统的原理是________。 I.有船速时才能达到通风;II.无风,无船速时不能达到通风;III.相对船有空气流动即可通风。
A.
Ⅰ,Ⅱ
B.
Ⅱ,Ⅲ
C.
Ⅰ,Ⅲ
D.
【单选题】船上自然通风系统的原理是________。1有船速时才能达到通风;2无风、无船速时不能达到通风;3相对船有空气流动即可通风。
A.
①②③
B.
②③
C.
①③
D.
①②
【简答题】听下面一段材料,回答第1-2题。 1. What does the woman want to do when greeted? A. Go to a conference. B. Get away from the man. C. Continue their last talk. 2. How does the woman feel when asked about the contact d...
【单选题】船上自然通风系统的原理是:1、有船速时才能达到通风;2、无风,无船速时不能达到通风;3、相对船有空气流动时即可通风
A.
①、②
B.
②、③
C.
①、③
D.
仅③
【单选题】根据下面材料,回答题。 Development in Newspaper Organization One of the most important developments in newspaper organization during the first part of the twentieth century ____46____, which are known as wire se...
A.
to play an important role in newspaper operations
B.
was the growth of telegraph services
C.
and they usually enjoy great prestige
D.
they are usually operated by a single owner
E.
in order to survive under the pressure of rising costs
F.
owned by a single person or organization
【单选题】船上自然通风系统的原理是()。 Ⅰ有船速时才能达到通风; Ⅱ无风,无船速时不能达到通风; Ⅲ相对船有空气流动即可通风。
A.
Ⅰ、Ⅱ
B.
Ⅱ、Ⅲ
C.
Ⅰ、Ⅲ
D.
仅Ⅲ
【多选题】通过对普通沥青材料的改性,可以改善以下哪些性能?
A.
改善抗老化性能
B.
增强抗疲劳性能
C.
提高高温稳定性
D.
改善与石子的黏附性能
E.
增强抗车辙的能力
【简答题】听对话,回答问题。 1. What is the matter with the woman? A. She has lost her way. B. She has missed the last bus. C. She can't find the subway station. 2. How far is the woman's hotel from here? A. It's 59 mil...
【单选题】船上自然通风系统的原理是:() ①、有船速时才能达到通风; ②、无风,无船速时不能达到通风; ③、相对船有空气流动时即可通风
A.
①、②
B.
②、③
C.
①、③
D.
仅③
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