单选题
The process of nuclear fission______requires the use of a reactor core, around which no lithium blanket of sufficient______has been developed to contain the hazardous byproducts of the process.
A、
(A) unfortunately… breadth
B、
(B) occasionally … unreliability
C、
(C) auspiciously … size
D、
(D) fortuitously… expense
E、
(E) technically … imagination
【正确答案】
A
【答案解析】
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