The valve stem and sealing surfaces are completely protected from dirt and corrosion by the stem cap, whether the valve is in an open or closed position.
不管是在阀门开启位置，还是关闭位置，阀杆和密封面有阀杆盖帽的保护，能防止污物入内，防止腐蚀。
It is a special kind of stem cells with highly proliferative and self-regenerative cap ability to maintain its number stable and generate tumor.
肿瘤干细胞是一种特殊类型的干细胞，具备高度增殖能力与自我更新能力，其结果是维持肿瘤干细胞数目稳定并产生肿瘤。
It is composed of a taper shank cap, a hollow taper shank, an awl perch, an awl stem casing, a permanent magnet and screwdriver heads of different format dimensions.
该改锥是由锥柄盖、空心锥柄、锥杆、锥杆套、永久磁铁和多个不同规格尺寸的改锥头组成。
This means that the 7/16" cap screw is secured down until the movement of the stem is restricted. check the clearance between the frame and the steering stem."
干这意味着，7 / 16“螺丝帽下的担保，直至运动受到限制。检查干间隙的框架和指导。
This means that the 7/16" cap screw is secured down until the movement of the stem is restricted. check the clearance between the frame and the steering stem."
干这意味着，7 / 16“螺丝帽下的担保，直至运动受到限制。检查干间隙的框架和指导。
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