12 millimeters.
Xiao Zhang's voice sounded a little weak.
"When the wind speed exceeds 8 meters per second, the actual load will increase by 30%."
Lin Laosan looked up at the window and said, "Yesterday evening I saw the power lines swaying in Xisi. The wind speed at that time was at least 10 meters per second."
Section Chief Zhang's glasses slipped down to the tip of his nose. He stared at the numbers on the report and suddenly slammed his hand on the table.
"No wonder! I was wondering why the power tripped for no reason!"
He turned around and dragged a roll of blueprints out of the metal cabinet, spreading it out on the table with a clatter.
"Comrade Lin, come and take a look at this. We're building a new substation near the Asian Games Village next year, and we're worried about not having anyone who understands the new technology."
Sunlight streamed through the window covered in frost flowers, falling on the dense lines of the blueprint.
Lin Laosan's fingers traced the dotted lines representing cable trenches, and he suddenly remembered the intelligent substation that his tutor had taken them to visit at the University of Hong Kong.
The data streams on the computer screen looked alive, and on the blueprint in front of me, there were several places marked with the words "manual operation" in red pencil.
Lin Laosan's expression grew increasingly serious.
He seems to have found his true direction in life.
When the get off work bell rang in the corridor, Section Chief Zhang realized that the snow outside the window had stopped.
Lin Laosan was still working on something at the edge of the blueprints, his pen writing rapidly on the paper, and a small circuit diagram was drawn next to the calculation formula.
That was a simple protective device he devised during the disaster relief efforts; a few diodes were enough to prevent the circuit from overloading.
"Xiaolin, why don't you come eat with us at the cafeteria tonight?"
Section Chief Zhang handed over an enamel bowl, saying, "Today we have braised pork with radish; the head chef's skills are quite good."
"OK!"
Lin Laosan put away the blueprints, smiled, and walked out with Section Chief Zhang.
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