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问题 单项选择题

当投捞器主要捞爪与打捞头或压送头相连接，定向爪、定位滑块臵于定向芯子内，靠（）和外套上、下移动来控制定向爪和定位滑块的收拢和释放。

A、打捞头

B、压送头

C、打捞头和压送头

D、定向芯子

答案

参考答案：D

单项选择题

A typical (11) language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" functions applied to "spaceless’ values, where the actual operation sequences and use of storage space during expression evaluation are organized behind the (12) . In this setting, values are data structures of low volume, typically a few computer words or less, which means that an illusion of spacelessness can be realized by having (13) results during expression evaluation stored at the discretion of the language implementation, and effecting parameter (14) and (15) operations through value copying.

A．foreground

B．background

C．screen

D．scenes
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问答题 简答题

什么是渗流流动？
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