Due to the related policy supports the credit loan environment in Chinese papermaking enterprises began to unloosen .

由于相关政策扶持，对中国造纸企业贷款限制开始 放松。

The stepper mechanism locking enables testing sealing set to unloosen and to withstand higher two-way differential pressure ;

步进机构锁紧，使 坐 封后 不 松动、 不 退位，能够承受较高的双向压差；