The words PIPE，BUTT，TUN AND PUNCHEON all refer to（）.
The fuel pipes and ducts should be blown with （）.
Large pipes or （） are fitted between the steam and water drums to ensure good natural circulation of water.
An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.
As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.
The remaining oil in the lubricating pipes and ducts should be blown out with （）.
What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.
A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.
The outside diameter of the pipe is （） the diameter of the bore of the piston rod, the result being that an annular space formed between the piston rod and the pipe.
Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.
The lubricating pipes and dusts should be blown out with （）.
The oil mist detectors continuously（） the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.
Any friction fit, tightness or adhesion of the part of any load being lifted should be broken by wedge or tapping and not by increasing the load on the applianceAccording to this sentence, （）
（）continuously extract the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity measuring track.
A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a（）.
Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.
The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to （）.
In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause （）.
In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.
All items such as steam pipes, exhaust pipes and fittings which, because of their location and operating temperature, present a hazard should be adequately lagged.That means the items should（）
The fuel booster pump and steam to fuel heater, together with fuel pipe heater tracer line should be shut off as soon as the （） order is acknowledged.
All items such as steam pipes, exhaust pipes and fittings which, because of their location and operating temperature, present a hazard should be adequately laggedThat means the items should .
Beneath the streets of a modern city （) of walls, columns, cables, pipes, and tunnels
当输气管的Re＞Re2时，为阻力平方区When Re＞Re2 of the gas pipe, is the resistance square area； 当输气管的Re1＜re＜re2时，为混合摩擦区when of the gas pipe, it is mixed friction zone； hydraulic smooth＞
