电子孔 meaning in Chinese

electron hole

Test method for evaluating unleaded automotive spark - ignition engine fuel for electronic port fuel injector fouling
电子孔燃料注射污垢非铅自动火花点火引擎燃料评价的试验方法
Pfi test method for evaluating gasoline detergent in use part 3 : test method for evaluating gasoline detergent produced effect for electronic port fuel injector fouling
评价汽油清净剂使用效果的试验方法第3部分:汽油清净剂对电子孔式燃油喷嘴