单项选择题

The process of nuclear fissionrequires the use of a reactor core, around which no lithium blanket of sufficienthas been developed to contain the hazardous byproducts of the process.

A． unfortunately… breadth
B． occasionally … unreliability
C． auspiciously … size
D． fortuitously… expense
E． technically … imagination

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单项选择题

单项选择题

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.