“A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft（）<br>A:a centrifuge<br>B:an electric motor<br>C:a bowl assembly<br>D:a driving motor

“A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft（）
A:a centrifuge
B:an electric motor
C:a bowl assembly
D:a driving motor

出自：海船船员证

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