题目内容
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.
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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.
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。( )
（ ）是人们从事的任何保持和促进当前健康的活动。
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