Cast iron carrier rings, （） machined grooves, are provided

【名词&注释】

添加剂(additive)、氧化铜(copper oxide)、.氧化铁

[单选题]Cast iron carrier rings, （） machined grooves, are provided for all the pistons.

A. caulked into
B. caulking into
C. pressed into
D. screwed into

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学习资料：

[单选题]使用含有（）的燃油添加剂，可使烟灰失去粘性，导致烟灰沉积趋势的减少。Ⅰ.氧化铜；Ⅱ.氧化铁

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ，Ⅱ都不对

[单选题]The engine will fail to start unless （）.

A. the pressure of the starting air is high enough
B. there is enough air in the air reservoirs
C. the air is supplied into the cylinders in the appropriate sequence
D. all of the above

[单选题]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time

[单选题]Bottom blow valves are installed on auxiliary water-tube boilers to （）

A. remove suspended and precipitated solids from the boiler water
B. completely drain the boiler in an emergency situation
C. prevent hardened scale deposits in the water drum
D. remove floating impurities from the oily water surface

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