还在试验当中或者非官方的MIME类型在二级分类开头会加一个“ x - ”。
Experimental, or unofficial MIME types are denoted with a subtype that starts with, "x -".
针对炼油厂含油废水的常规生化处理工艺对氨氮的降解效果较差，采用曝气生物滤池作为二级生化进行试验研究。
Aiming at the poor effect of amino nitrogen degradation in conventional refinery oil sewage treatment, the secondary biochemical test was carried with biological aeration filter pool.
针对某系列反舰导弹打靶实例中机电引信出现二级保险提前解除的问题进行了理论分析和试验。
The theoretical analysis and test is carried out for the premature releasing for the two-stage safety of electromechanical fuze in a real flight of antiship missile.
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