What is PPM? PPM stands for Planned Preventative Maintenance, more commonly referred to as simply planned maintenance or scheduled maintenance. It is a proactive approach to maintenance that ensures all your upcoming works, including Fire Risk Assessments, seasonal upkeep, and safety checks, are sched...
Speaking of which, you’re going to need to know what ppm range you want for your water. This can vary depending on which nutrients you use, but here are some good guidelines: Tap water: 400ppm or below; 400 is high for tap water. Nutrient Water: 400ppm – 800ppm total DWC ...
What a good place! The water is clean and the air is f .相关知识点: 试题来源: 解析 (f)resh 【详解】 句意:多好的地方啊!水很干净,空气很新鲜。空处应填形容词作表语,表示主语“空气”的属性,fresh“新鲜的”符合语境。故填(f)resh。
at low stocking densities to ensure good water quality and the growth of happy, stress free fish. When we feed the fish, they produce ammonia, which left unfiltered, can become toxic to the fish. Proper filtration of solid waste, aeration, temperature and water quality monitoring is essential...
A: What is the matter?/What is wrong (with you)?B: I have a cold.A: You should take some medicine.2. A: What is the matter?/What is wrong (with you)?B: I have a fever.A: You should have a good rest and drink more water.3. A: What is the matter?/What is wrong (...
16. What is the man’s advice for the woman? A. Come back later. B. Talk to the manager. C. Postpone the meeting. 17. What will the woman probably do next? A. Tidy up a room. B. Make a phone call. C. Go for a coffee. ...
In the water, TDS is identified as parts per million (ppm) or mg/L. Since TDS does not risk people's health, the EPA has not identified a TDS limit. However, it suggests that the drinking water only has a level of up to 500 ppm. If the water has above 500 ppm, the...
null冀教版 英语 三年级下册Unit 2 Good food, good healthLesson 1 What would you like for breakfast? Unit 2 Good food,good healthTalk about breakfast.Talk about lunch.Lesson 1 What would you like for breakfast?Lesson 2 A good lunchLesson 3 We need a healthy diet.Describe your three meals...
Quality of life is, above all, an individual calculation. Most of us, however, include good health, good friends, loving relationships, and some degree of creature comforts in the factors they assess. It may sound distasteful, but the money we have and the ways we get it have a big role...
6. Nancy is a n nurse and she works in a hospital. 7. She said she would never forget some pleasant e experiences while working there. 8. She has a very sore t throat . She should drink water. 9. Tina had too much cold food this morning, so she has a ss_t_o_m_a_c_h_a...