A ≤10cfu/m<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20240405/13375423_0.gif"> B
≤100cfu/m<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20240405/13375423_0_1.gif"> C
≤200cfu/m<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20240405/13375423_0_2.gif"> D
≤500cfu/m<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20240405/13375423_0_3.gif"> E
≤20cfu/m<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20240405/13375423_0_4.gif">