However, new rated smoke card has not yet become effective, and original rated smoke card, of which symbol of smoke intensity value stipulated to be R b is still used, a definite error is therefore caused in smoke measurement. 但由于尚未发布实施新的标准烟度卡,而仍然使用旧的标准烟度卡(烟度值为Rb),因此给烟度测量造成了一定的误差。