What are the two main types of stud link chain?（）<br>A:Oil Rig chain and Oil Field Stud Link chain<br>B:Flash-butt welded chain and Di-Lok chain<br>C:Flash-butt welded chain and Oil Rig chain<br>D:Oil Field Stud Link chain and Flash-butt welded chain

What are the two main types of stud link chain?（）
A:Oil Rig chain and Oil Field Stud Link chain
B:Flash-butt welded chain and Di-Lok chain
C:Flash-butt welded chain and Oil Rig chain
D:Oil Field Stud Link chain and Flash-butt welded chain

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