Percussive piling work is prohibited during the restricted hours and requires a permit even during daytime .
至于撞击式打桩工程，则禁止在限制时间内施工；即使在日间进行，也须领有许可证。
Involving percussion or featuring percussive instruments .
关于或有打击乐器特色的。
Some of the aircraft using the percussive attack , while others will be fired weapons to attack .
敌机有些是采用撞击的方式攻击，有些则是会发射武器来攻击。
A valid construction noise permit issued by the environmental protection department is required for the carrying out of percussive piling during the permitted hours .
