Question

What was the watchman doing at the tank?

Answer 1

Explanation:

The Watchman Sonic works by firing a beam of radiowaves down into the tank. These waves then bounce off the oil, the watchman measures the time it takes to receive the “echo” back which it uses to calculate the oil level. If there any objects or debris in the way of the beam then this error may occur.

Answer 2

Answer:

check out ur text book ...................

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