影响齿轮齿面接触应力σH的主要几何参数是 和 ; 而影响其极限接触应力σHlim的主要因素是 和 .
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You can search for what you want to buy with the ()
A. key
B. keyword
C. keyboard
D. information
Title description is usually the first step of ()
A. release products
B. releasing products
C. search products
D. searching products
The beautiful pictures of the product () buyer's desire to buy.
A. attribute
B. accurate
C. stimulates
D. template
The title of products on AliExpress can be set up to () characters.
A. 140
B. 135
C. 128
D. 126