By adjusting the axial position of the roller shelf and the pump body, gap between pressure-bearing pipes changes within a certain range, thereby the application scope of the pump head is expanded.
该蠕动泵通过调节滚轮架与泵体的轴向位置，使压管间隙在一定范围内变化。从而扩展了泵头的使用范围。
Provisions on the specific scope of state secrets and scope of each classification level shall be published within a certain range and adjusted in light of changes of situations.
国家秘密及其密级的具体范围的规定，应当在有关范围内公布，并根据情况变化及时调整。
Provisions on the specific scope of state secrets and scope of each classification level shall be published within a certain range and adjusted in light of changes of situations.
国家秘密及其密级的具体范围的规定，应当在有关范围内公布，并根据情况变化及时调整。
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