double layer bar winding 双层杆式绕组
double layer hard bus bar 双层硬母线
double-layer composite bar 双层复合材料杆
By the use of the variational principle of complementary energy, the closed form of the stresses of double-layer composite bar is obtained.
运用最小余能原理，求得了双层复合材料杆温度应力的封闭解。
The face mask consists of double-layer non-woven cloth in which filter layer, nose bridge bar and face mask belt is set, or is made of multi-layer medical absorbent gauze.
口罩由双层无纺布中间夹过滤层、鼻梁条和口罩带构成，或由多层医用脱脂纱布经缝制而成。
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