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（）...

第1题

[单选题] In order to control thermal stresses, some types of modern engines use pistons with（）

A、heavy wall and intensive cooling B、heavy wall and no cooling C、thin wall and no cooling D、thin wall and intensive cooling

点击查看答案

第2题

[] The presence of stratus clouds and a dying wind will usually result in（）.

A、A.heavy rain B、B.heavy snow C、C.thick fog D、D.clearing skies

点击查看答案

第3题

[单选题] It is easier to replace a dry cylinder liner than a wet one because（）

A、of the thin wall thickness B、honing makes it easier to maintain the desired oil ilm C、water seals are not required D、it fits more loosely due to a decrease in heat transfer through the composite wall

点击查看答案

第4题

[单选题] Cylinder liners from older lower powered engines had a uniform wall thickness and the cooling was achieved by circulating cooling water through a space formed between （）.

A、crown and skirt B、liner and jacket C、ring and groove D、jacket and block

点击查看答案

第5题

[单选题] The （）(重吊杆) can lift heavy cargo.

A、heavy cargo derrick B、heavy deck C、jumbo boom D、heavy block

点击查看答案

第6题

[单选题] If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）

A、micro-seizure B、sticking C、scratched D、breakage/ollapse

点击查看答案

第7题

[单选题] 如果有一个名为FLOOR1的外部参照，它包含一个名为WALL的图层，在用什么选项绑定后，依赖外部参照的图层FLOOR1|WALL将变为内部定义的图层FLOOR1$0$WALL（）。

A、融入 B、插入 C、绑定 D、嵌入

点击查看答案

第8题

[] 如果有一个名为FLOOR1的外部参照，它包含一个名为WALL的图层，在用什么选项绑定后，依赖外部参照的图层FLOOR1|WALL将变为内部定义的图层WALL（）。

A、A.融入 B、B.插入 C、C.绑定 D、D.嵌入

点击查看答案

第9题

[] When installing rings on a diesel engine piston, you should check the ring（）

A、A.diametrical tension B、B.gap clearance C、C.radial thickness D、D.face thickness

点击查看答案

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（）.

请使用微信扫码支付