— What should I do before operating the new machine?

— You’d better read its ______ first carefully.

A．explanations

B．instructions

C．descriptions

D．introductions

淋巴瘤倒Y野放疗范围包括（）

A.脾脏、腹主动脉旁

B.腹主动脉旁、胃左淋巴结

C.脾脏、胃左淋巴结、脾门淋巴结

D.腹主动脉旁、胃右淋巴结

E.脾门淋巴结、腹主动脉旁