Shanghai 1955, Useless Materials Are Also Life-Threatening

[Era + time travel + space + technological power, with cp] Wearing 1955, Lin Wanshan's survival list is a bit long: [Task 1: Take over your identity and survive in the machinery factory] [Mission 2: Avoid the deadly temptation of the enemy's "Shadow"] [Mission 3: Secretly use future technology in space to support the country] [Task 4: Don't let the overly handsome and sharp-eyed Qin Ming from the technical department next door discover the secret! In order to complete the task, she screwed screws during the day and returned to the space at night to study "Materials" and "Mechanical Principles". "Comrade Qin, there is a small problem with this drawing..." She pointed out casually. Qin Ming adjusted his glasses and looked inquiringly: "How can a first-level lathe know this?" Lin Wanshan (scratching her head guiltily): "I... My father mentioned it before..." Unexpectedly, just as she used "dreams" to explain away a technical problem, she discovered that Qin Ming was the one who helped her stop the secret investigation of the "source of mysterious technology"! He handed her a cup of hot water and said gently: "You've been working hard lately. Go to bed early." Lin Wanshan took the water glass, her palms feeling cold. Is this glass of water concern or testing? Is this man a comrade or... An enemy?