In pull exchanges the application initiates the transfer by sending some form of request to the bus and receiving one or more queued-up messages in response.

在pull交换中，应用程序通过给总线发送某种形式的请求并接收一个或多个在响应中排队等候的消息来启动传输。

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This service ComcastCares would take any form of service request from customers online and respond through the efforts of a team of customer service representatives.

FORBES: A Tale of Maintaining Congruency In Customer Service

In a way, the Getty-sponsored exhibit is an unusual form of a request-for-proposal, as well as an important step toward Govan and his board's actual goal: to shift the balance of art and culture westward to the land of swimming pools and movie stars.

WSJ: Michael Govan, the Man Behind LACMA | WSJ. Magazine May 2013

It appears that Elliott also sought an expungement of his Form U5 but the full nature of that request is not set forth in the Decision.

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