X线头颅定位片描绘图中表现上颌对颅底的位置关系是

A．SNA角度

B．SBN角度

C．ANB角度

D．SAN角度

E．SNB角度

UCP600 is a code to standardize the conditions under which bankers are prepared to issue（）.

A．traveler’s cheque

B．documentary collection

C．bills of exchange

D．documentary credit