题目内容

The failure modes of ordinary bolts include: when the diameter of the bolt is small and the plate is thick, the bolt may be .

A. cut off
B. crushed down
C. split by tension
D. damaged by bending

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Under the action of external force, the contact surface of the member tends to separate. At this time, the bolt is subjected to the along the axial direction, so the failure is the split of the bolt bar at tension.

A. shear force
B. pulling force
C. compression
D. torsion

For friction-type connections, part of the shear force is transferred by the contact surface in front of the hole, which accounts for of the bolt's transfer force, so the calculation formula of the net cross section can be obtained.

A. 25%
B. 50%
C. 75%
D. 100%

气候变暖会对人类健康产生多种有害影响。( )

铁具有消除眼睛紧张的作用。( )

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