The positioning apparatus also includes a lifting device for raising and lowering the outer cylinder. The lifting device includes a threaded drive mechanism coupled to the piston.
The electrical conductivity of Beijing dolomite and limestone has been studied by means of a high pressure apparatus of solid medium pistoncylinder type.
利用固体介质活塞圆筒式高压容器测量白云岩与石灰岩的电导率。
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The positioning apparatus also includes a piston arranged within said outer cylinder such that the piston and the outer cylinder define a fluid compartment within the outer cylinder.