With exocylic double bonds the effect of strain is in the opposite direction .
环外的双键的张力效应导致相反的结果。
The double direction Thrust ball bearings can support bi-directional loads.
在双向推力球轴承可以承受双向的负载。
Two arch ribs are installed in transversal direction to form a"double bow system".
四川绵阳飞云大桥的主桥系三跨系杆拱桥，横向设两根拱肋，构成“双弓体系”。
Two arch ribs are installed in transversal direction to form a"double bow system".
四川绵阳飞云大桥的主桥系三跨系杆拱桥，横向设两根拱肋，构成“双弓体系”。
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