【Daily Topic】【Engineering Version 20160520】
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Participation reward: 2 Wealth. Reward for correct answer: 9 Wealth. Multiple-choice question: The requirements for coal mine permits** include ( ). A. It should not cause local high temperatures in the mine atmosphere after detonation; therefore, for use in coal mines, the **explosive heat, temperature, and pressure should all be relatively low.**B. It should have good sensitivity to initiation and a strong ability to propagate the explosion, ensuring stable detonation.
C. The amount of toxic gases released must meet **specified standards**, and the oxygen balance should be as close to zero as possible.
D. The **composition should not contain metal powders.**
E. It cannot be initiated **directly**
The requirements for permissible ** in coal mines include (ABCD). A. It should not cause local high temperatures in the mine atmosphere after detonation; therefore, for use in coal mines, the **explosive heat, temperature, and pressure should all be relatively low.**
B. It should have good sensitivity to initiation and a strong ability to propagate the explosion, ensuring stable detonation.
C. The amount of toxic gases released must meet **specified standards**, and the oxygen balance should be as close to zero as possible.
D. The **composition should not contain metal powders.**
E. It cannot be initiated **directly**
B. It should have good sensitivity to initiation and a strong ability to propagate the explosion, ensuring stable detonation.
C. The amount of toxic gases released must meet **specified standards**, and the oxygen balance should be as close to zero as possible.
D. The **composition should not contain metal powders.**
E. It cannot be initiated **directly**
A. It should not cause local high temperatures in the mine atmosphere after detonation; therefore, for use in coal mines, the **explosive heat, temperature, and pressure should all be relatively low.**
B. It should have good sensitivity to initiation and a strong ability to propagate detonation, ensuring stable detonation.
C. The amount of toxic gases released must meet **specified standards**, and the oxygen balance should be as close to zero as possible.
D. The **composition should not contain metal powders.**
B. It should have good sensitivity to initiation and a strong ability to propagate detonation, ensuring stable detonation.
C. The amount of toxic gases released must meet **specified standards**, and the oxygen balance should be as close to zero as possible.
D. The **composition should not contain metal powders.**