sử dụng sợi photonic crystal fibers pcfs

wonders of numbers

wonders of numbers

Ngày tải lên: 28/10/2014, 23:31

417 873 0
Tài liệu Present perfect continuous & Present perfect continuous and simple pptx

Tài liệu Present perfect continuous & Present perfect continuous and simple pptx

... My hands are very dirty I’ve been repairing the car Tay bẩn Tôi sửa xe The car is OK again I’ve repaired it Chiếc xe lại tốt Tôi sửa She’s been smoking too much recently She should smoke less...

Ngày tải lên: 19/01/2014, 17:20

5 898 3
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