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肌肉收缩时张力改变而长度不变的收缩形式为（）

A．等长收缩
B．等张收缩
C．单收缩
D．强直收缩

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各大公司推出的物联网平台在功能上均完全一致，例如阿里云LinkPlatform与百度物接入Hub。（）

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单项选择题

Which of the following descriptions of R is incorrect?
A、a language and environment designed for statistical computing and graphics
B、an integrated suite of software facilities for data manipulation, calculation, and graphical display
C、open-sourced
D、includes integrated development environments