Variable bore ram-type blowout preventer, the improved type, is capable of sealing drill tools whose sizes are within a certain range, and has advantages of low cost and convenience.
可变径闸板防喷器作为新型的闸板防喷器，能够密封一定范围内多种规格的钻具，具有成本低，使用方便的优点。
Variable bore ram-type blowout preventer, as an improved blowout preventer, is capable of sealing around drill pipes with a range of sizes and has advantages such as low cost and convenience.
可变径闸板防喷器作为新型的闸板防喷器，能够密封一定范围内多种规格的钻具，具有成本低、使用方便等特点。
Ram-type blowout preventer is important equipment used in oil drilling operation.
板防喷器是石油钻井过程中的一种重要设备。
This thesis introduces the impact ram structure for HCD110 type and its optimizing design for working springs.
文中介绍了HCD110型振动冲击夯结构，对其关键件——工作弹簧的设计进行了研究。
Ram extension pile is widely used in reinforcement work for construction foundation as a new type reinforcement pattern.
夯扩桩作为一种新型地基加固方式在我国建筑地基加固中得到了越来越广泛的应用。
In 1986, changsha construction machinery research and develop a larger HZR450 type of vibrating plate ram.
1986年长沙建设机械研究所又开发了较大的HZR450型振动平板夯。
A type of RAM that retains its data even when the system is powered down.
一种能在系统关机的情况下保持它的数据的RAM。
Applying the bi-processor and bi-port RAM, the paper designs a new type intelligent sub-station on basis of the sub-station of the current monitoring sys-tem for the tramroad conveyance.
运用双处理器和双端口RAM，在现有轨道运输监控系统分站的基础上设计了新型智能分站。
The ram-compaction pile with composite bearing base is a new type of technology, which has the characters of high bearing capacity and convenient construction process.
复合载体夯扩桩是一项新技术，它承载力高、施工简便、适用范围广。
We speculated that a WUS-type atypical HD protein might also be involved in the specification and maintenance of the root apical meristem (RAM) stem cells of rice.
我们推测含有非典型HD的类WUS蛋白可能也参与到水稻根分生组织干细胞的维持与分化过程中。
We speculated that a WUS-type atypical HD protein might also be involved in the specification and maintenance of the root apical meristem (RAM) stem cells of rice.
我们推测含有非典型HD的类WUS蛋白可能也参与到水稻根分生组织干细胞的维持与分化过程中。
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