12月7日-16日,联合国《生物多样性公约》缔约方大会第十五次会议(CBD COP15)第二阶段会议正在加拿大蒙特利尔召开。来自196个缔约方的超过万名与会者齐聚于此,希望达成一项对全世界而言具有里程碑意义的国际自然保护协议——“2020年后全...
The anti-slip device comprises at least one housing (6, 7; 9; 11; 13, 14) opening into the bore hole (2) receiving the fixing screw (3) and at least one retaining means (8; 10; 12; 15, 16) which can be elastically deformed under the effect of pressure enabling the screw (3)...