A different method is usually employed for welding sheets or plates of metal together, which is known as spot welding.

5) 燃料燃燒時所需要的空氣，用空氣噴射器或風機經爐篦吹入。進去的空氣量，正好綽綽有余地供給燃料完全燃燒。

The air which is needed by the fuel for combustion is blown across the firegrate by air jets or fans, making the amount of air which is allowed to enter just more than sufficient for the complete combustion of the fuel.

6) 一個結構物受到的荷載可以分為靜載和活載兩種。靜載包括該結構物各部分的重量?；钶d是由于人，可移動的設備等等的重量所造成的。

The loads a structure is subjected to are divided into dead loads, which include the weights of all the parts of the structure, and live loads, which are due to the weights of people, movable equipmant, etc.

7) 承受的荷載和軸心線成直角的是徑向軸承。承受的荷載和軸心線平行的是止推軸承。這是現(xiàn)代機器使用的兩種主要軸承。

Radial bearings, which carry a load acting at right angles to the shaft axis, and thrust bearings, which take a load acting parallel to the direction of shaft axis, are two main bearings used in modern machines.

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