_____we are not attacked by nuclear weapons, we promise that under no circumstances _____ use the

bomb first but we reserve the right to use it for counter-attack when necessary.

[      ] 

A. As long as; we shall

B. If; shall we

C. So long as ; shall we

D. Even if; we shall

按照供应商的供货地点可分（）

A.直接供应

B.集中供应

C.分散供应

D.间接供应