The load reacting unit (9) preferably comprises a fluid pressure unit and the indicator (60) comprises a mechanical indicator that operates at a predetermined pressure threshold.
负载反应单元(9)优选地包括流体压力单元，指示器(60)包括在预定压力阈值下操作的机械指示器。
The load reacting unit (9) preferably comprises a fluid pressure unit and the indicator (60) comprises a mechanical indicator that operates at a predetermined pressure threshold.
负载反应单元(9)优选地包括流体压力单元，指示器(60)包括在预定压力阈值下操作的机械指示器。
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