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MDX is a tool that blends Markdown and JSX syntax, allowing developers to use existing components within Markdown files and import MDX files as components. Key characteristics include:

• Customizable: Developers can define which component renders for specific markdown constructs.
• Markdown-based: Maintains the simplicity of markdown, using JSX only when necessary.
• Performance: MDX has no runtime; all compilation occurs during the build stage for high performance.

Coal mine employees have several fundamental safety rights and obligations:

• Rights: The right to know about safety and occupational hazards (Right to Information), the right to safety production supervision, the right to stop work in unsafe conditions, the right to receive safety education and training, and the right to timely rescue, medical treatment, and industrial injury insurance compensation after an accident.
• Obligations: Employees must strictly follow the unit's safety production rules and operating procedures, obey management, and correctly wear and use labor protection equipment.
• Right to Refuse: Employees have the right to refuse to go underground if there is no leadership on duty.

Key principles and regulatory requirements for coal mine safety production in China include:

• Basic Principle: The fundamental principle is "Management, Equipment, and Training" (管理、装备、培训并重).
• Safety Policy: The guiding policy is "Safety First, Prevention First, Comprehensive Governance" (安全第一，预防为主，综合治理).
• Priority: When production and safety conflict, "Safety First" must be maintained.
• Safety Production Definition: Ensuring that human life and health are not endangered and property is not lost during production activities.

Operational requirements for mine ventilation:

• Basic Tasks: Provide breathable air for workers, prevent spontaneous combustion of coal, dilute and remove toxic/harmful gases, and create a favorable climate.
• Gas Accumulation Hotspots: Methane tends to accumulate at the faces of descending tunnels (down-hill) and in the upper corners of working areas.
• Accumulation Factors in Tunneling: Local ventilation fans being turned on/off intermittently, severe leakage in ventilation ducts, circulation air produced by local fans, and insufficient total wind pressure supply.
• Critical Threshold: If methane concentration reaches 1.5% in the airflow of working faces or within 20m of electric motors/switches, workers must stop work, cut power, and evacuate personnel.

Administrative requirements for mine safety:

• Responsibility System: The Mine Manager (矿长) is ultimately responsible for the safety production of the enterprise. A comprehensive responsibility system must be established across leadership, functional departments, and individual posts.
• "One Pass, Three Preventions" (一通三防): Includes dust prevention management (防尘管理制度). Note: Electromechanical management (机电管理制度) is NOT part of this specific system.
• Reporting: Personnel discovering accident hazards must report immediately to on-site safety management personnel or the unit head.
• Hazard Reporting Rewards: Valid reports of major safety hazards can be rewarded between 1,000 and 10,000 RMB.
• Dust and Poison Prevention: Facilities must be regularly tested for operation and concentration, and results must be published to employees.

The required gas drainage rate is determined by the absolute gas emission (Q) as follows:

• If 70 ≤ Q ≤ 100 m³/min: Drainage rate must be ≥ 60%
• If 40 ≤ Q ≤ 70 m³/min: Drainage rate must be ≥ 50%
• If 20 ≤ Q ≤ 40 m³/min: Drainage rate must be ≥ 40%