B.聚变,核燃料为铀
C.裂变,核燃料为氘
D.聚变,核燃料为氘
答案:A
We should well balance our work and relaxation, and only by doing that, as everybody would agree , ______ a good state of mind.
A.can we have
B.we can have
C.need we have
D.we need have
竞技运动的现代社会价值主要体现在激励人类的()精神,显示()的综合实力等方面