题目内容
Thailand expects to lose $9.7 billion in income from Chinese travelers through July.
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Countries outside of East Asia are also feeling the loss of Chinese tourists.
In the United States, Tourism Economics has predicted a 28-percent drop in Chinese visitors.
The World Travel and Tourism Council says it usually takes 90 months for visitor numbers to recover after a virus outbreak.
液压缸采用差动连接时，若使两个方向的运动速度相等，则活塞杆与活塞直径之间的关系是（ ）
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