Check-In at the Beginning: I Was Engaged in Infrastructure Construction in Ancient Times

(Sign in, infrastructure, no heroine, cool article) Chen Yuanshan traveled through time and became a useless county magistrate who was demoted to the frontier. The land is saline-alkali, the people are old and weak, and even the mice in the warehouse are crying to move. The first day of system activation: "Successfully signed in and received 100 kilograms of hybrid rice seeds." The next day: "Sign in successfully and get the primary irrigation drawing × 1." Day Three: "Sign in successfully and get cement formula ×1." Others can harvest eighty catties from one acre, but he can harvest eight hundred catties from one acre. The county magistrate next door was jealous and brought his officers and soldiers to grab food. Chen Yuanshan looked at the thirty red cannons set up on the city wall - they were signed in on the fifteenth day. He picked up the tea cup and smiled slightly: "Can you say it again?" The enemy besieged the city for three months, and the people inside the city were eating braised meat, while the enemy troops outside the city were so hungry that they were chewing tree bark. The imperial court was furious and sent a large army to conquer. Chen Yuanshan looked at the reward description on the 999th day of signing in - [Aircraft Carrier Construction Drawing × 1] and fell into deep thought. "System, my county... Is inland." System: "So?"