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When assembling instruments in experiments, the principle of _ _ _ _ is generally followed.
from below

Reason:

When assembling instruments, if heating is needed, the principle of bottom-up is generally adopted in order to determine the height.

When the vertical distance between the heated instrument and the iron frame is not equal to the height of the outer flame of the alcohol lamp, it will lead to the inability to heat or touch the flame center.

Attached:

Modern commonly used experimental instruments include test tube, beaker, evaporating dish, crucible, alcohol lamp, Buchner funnel, gas washing cylinder, drying tube, tray balance, measuring cylinder, volumetric flask, burette and gas measuring device.

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