1.4 Which of the following is not true?____(1分)-湖北继续教育网网校

[单选题]1.4 Which of the following is not true?____(1分)

AFriction exerts great influence on our daily life and production.

BFriction is completely a disadvantage at all.

CWhen used properly, friction can be an advantage in improving the performance of machinery.

DThe functions of friction have two aspects: negative and positive.

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B

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