题目内容

只要受力物体处于平衡状态，其摩擦力大小F=fsFN

A. 对
B. 错

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物重G=100N置于水平面上，物体与平面之间的摩擦因数f= 0.3,当物体所受水平力F分别为10N、30N、20N时，则摩擦力分别为、、。当F= N时，达临界状态。

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The function that the immune system recognizes and removes mutant cells or malignant cells is called

A. Immune defense
B. Immune deficiency
C. Immune surveilance
D. Immune homeostasis
E. Immune tolerance

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The immune molecules with specific immune function include

Antibodies
B. Antimicrobial peptides
Cytokines
D. MHC molecules
E. Complements

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The characteristics of adaptive immunity include

A. Immunological memory
B. No specificity for pathogens
C. Acquired by heredity
D. It includes physical barriers and chemical barriers
E. It works quickly in the early stage of infection

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只要受力物体处于平衡状态，其摩擦力大小F=fsFN

A. 对 B. 错

物重G=100N置于水平面上，物体与平面之间的摩擦因数f= 0.3,当物体所受水平力F分别为10N、30N、20N时，则摩擦力分别为 、 、 。当F= N时，达临界状态。

The function that the immune system recognizes and removes mutant cells or malignant cells is called

The immune molecules with specific immune function include

The characteristics of adaptive immunity include

A. 对
B. 错

物重G=100N置于水平面上，物体与平面之间的摩擦因数f= 0.3,当物体所受水平力F分别为10N、30N、20N时，则摩擦力分别为、、。当F= N时，达临界状态。