下面不是局部麻醉的方法是______。

A．表面麻醉
B．浸润麻醉
C．传导麻醉
D．脊髓麻醉
E．直肠内麻醉

In the foreign trade business, the payment is always made by L/
C．In this sentence, L/C is the abbreviation for ______.

A．bill of Lading
B．commercial Invoice
C．buying Contract
D．letter of Credit