Made in usa . d - mark develops a complete line of quality thin bed adsorptive products for odor and pollution control serving the hvac , air cleaning and appliance industries 美国制造。提供多种高效活性碳除臭产品及各种过滤网，有助减少及控制空气污染，以维持一个舒适、健康及安全的工作和居住环境。极适合各商业机构、维修部门、工程公司及物业管理公司所使用。
To control air pollution , the government will impose caps on the total emissions of the power companies . we will also make it a policy to require them to maximise the use of natural gas in power generation and develop renewable energy 在控制空气污染方面，政府会向电力公司定出排放总量上限，在政策上贯彻尽量使用天然气发电的要求，以及发展可再生能源。
But there ' s still some way to go15 on the air pollution front , 16 particularly for17 lorries which run on diesel fuel , 18 which is bad19 because of its particulate emissions20 ? the soot particles emitted when it is burnt 但是在控制空气污染方面仍然任重而道远，特别要解决烧柴油卡车的问题，因为柴油燃烧时产生的颗粒状排放物，即所排放的油烟颗粒，对环境有害。
49 . to control air pollution , the government will impose caps on the total emissions of the power companies . we will also make it a policy to require them to maximise the use of natural gas in power generation and develop renewable energy 49 .在控制空气污染方面，政府会向电力公司定出排放总量上限，在政策上贯彻尽量使用天然气发电的要求，以及发展可再生能源。
By deenergizing of coil , control air moves the single - acting cylinder to the stop position through the pipe named “ supply ” , the double check valve ( pos . no . 72 - 2 ) , the 3 - way magnet valve ( pos . no . 77 , lower frame ) and the 3 - way valve ( pos . no . 78 , lower frame ) 通过其线圈断电，控制空气移动单作用汽缸到停止位置通过supply管路，双向截止阀72 - 2 ，三通电磁阀77下位和三通阀78 ，下位。
So the pressure signal of control air holds the single - acting cylinder at the stop position through the pipe named “ supply ” , the 3 - way valve ( pos . no . 22 , upper frame ) , the double check valve ( pos . no . 72 - 1 ) and the quick release valve ( pos . no . 41 , right frame ) 因此控制空气的压力信号保持单作用气缸在停止位置通过管路supply ，三通阀22 ，上位，双向止回阀72 - 1和快速泄放阀41 ，右位。
To ensure sustainable urban growth , development and improvement of urban utilities including water and gas supplies , sewage and waste disposal systems , air pollution control , construction of community facilities and urban commuting systems are being undertaken or incorporated into various development plans 为确保城市可持续发展，多个发展计划均涉及建设和改善市政公用事业，如供水、供气、污水及废物处理、控制空气污染、建设社区设施和市区集体运输系统等。
The 3 - way magnet valve ( pos . no . 77 ) is never energized again ( upper frame ) , but if the cause of deenergizing is eliminated and the electric circuits of the engine protecting system are reset , the 3 - way magnet valve ( pos . no . 77 ) is energized ( upper frame ) , then the control air which has actuated the single - acting cylinder ( pos . no . 21 ) being rapidly blown off through the quick release valve ( pos . no . 41 ) 三通电磁阀77决不会再次通电上位，但如果断电的原因被消除而且主机安保系统电气回路被复位，三通电磁阀77被通电上位，作用在单作用汽缸21的控制空气已被迅速放出通过快速泄放阀41 。
