问题
选择题
As young people, we should try to be ______ brave______ careful. [ ]
A. either, or
B. neither, nor
C. not only, but also
D. not, but
答案
答案：C
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As young people, we should try to be ______ brave______ careful. [ ]
A. either, or
B. neither, nor
C. not only, but also
D. not, but
答案：C
（氦3），它是一种高效、清洁、安全的核聚变燃料，其参与的一种核聚变反应的方程式为
。关于
聚变下列表述正确的是 [ ]
聚变反应发电