BEIJING — The exposed plastic and aluminum has kept even the most human-like robots feeling unmistakably artificial. But X-Humanoid in Beijing is hoping that will change soon, as it gave NBC News a tour Thursday around its sprawling facility where it showed off a bionic face prototype, complete with hair and artificial skin. “If the robots look more like humans, they can do a lot of stuff that humans can do,” said Nikita Gao, who handles the overseas market for the company. Chinese robotics has