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【单选题】
压路机全液压转向器慢转快转转向均沉重可能的故障原因是（）。A.
用力小
B.
钢球单向阀失效，脏物卡住
C.
转向变形
D.
溢流阀调定压力高
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【简答题】根据短文和首字母填空（每题0.5分，共5分） Bill and Simon were good friends. One summer they were on h___1____.They wanted to sail around the Caribbean Sea in their boat for two weeks. During their trip, they saw many wh...
【简答题】阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。 E All areas of the world face a nurses shortage. But the shortage is most severe in developing countries. Many of their nurses move to the more develope...
【简答题】E. The Caribbean 1. When ____________________________________ ________? During the 1950s. 2. Where _________________________________? In Notting Hill in west London.
【简答题】E. The Caribbean 1. _____ did people from the Caribbean islands arrive in the UK? (date) 2. ______ does the Notting Hill Carnival take place? (place)
【简答题】综合填空。根据短文内容及首字母提示，填写所缺单词，使短文意思完整。每空限填一词。 Bill and Simon were good friends. One summer they were on (1)h______. They wanted to sail around the Caribbean Sea in their boat for two weeks. During their tr...
【判断题】IV Watching Task E xercise 1 D irections : Listen to the dialogue and decide if the dialogue statements you hear are true of false. Write a T for a true statement and an F for a falsestatement in the ...
A.
正确
B.
错误
【简答题】Bill and Simon were good friends. One summer they were on (1) h ____ . They wanted to sail around the Caribbean Sea in their boat for two weeks. During their trip, they saw many whales. Bill and Simon...
【单选题】单模光纤有哪些优点？
A.
单模光纤具有极小的色散和极低的损耗，具有大传输带宽和长中继距离
B.
单模光纤中基模的相位、偏振、振幅等参数对于各种外界物理量极为敏感,可以制成各种光纤传感器
C.
利用单模光纤的非线性效应可制成光纤激光器与光纤放大器
D.
以上均是
【简答题】单模光纤中与非弹性散射相关的非线性效应是 和 。
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