部 bù - measure word

一部 [yī bù] a literary or artistic work; a set of equipment

部: a literary or artistic work

一部电视剧 [diàn shì jù] a television drama

一部电影 [diàn yǐnɡ] a movie

一部纪录片 [jì lù piàn] a documentary

一部文学作品 [wén xué zuò pǐn] a literary work

一部传记 [zhuàn jì] a biography

一部喜剧 [xǐ jù] a comedy 

一部小说 [xiǎo shuō] a novel

一部音乐作品 [yīn yuè zuò pǐn] a musical work

部: a set of equipment

一部电话 [diàn huà] a telephone

一部望远镜 [wànɡ yuǎn jìnɡ] a pair of binoculars

一部摄像机 [shè xiànɡ jī] a video camera

一部手机 [shǒu jī] a cell phone

一部照相机 [zhào xiànɡ jī] a camera

While 一台 [yī tái] is used for most nouns ending with 机 [jī], particularly when the object is heavy or has a large base, for light and portable equipment the measure word is 一部 [yī bù], for instance with 电话 [diàn huà, telephone], 手机 [shǒu jī, cell phone], and 照相机 [zhào xiànɡ jī, camera].

However, for 订书机 [dìnɡ shū jī, stapler], 一台 [yī tái] is more often used than 一部 [yī bù]. 一部 is used with an episode of a television drama, soap opera, or a movie: —部电视剧 [yī bù diàn shì jù, a soap opera]; 一部电影 [yī bù diàn yǐnɡ, a movie]. For an artistic performance on television, 一台 [yī tái] is more often used than 一场[yī chǎnɡ], whereas for a stage performance in a theater, —场 [yī chǎnɡ] is more often used.