问题
选择题
The lady walked around the shops, ______ an eye out for bargains. [ ]
A. keep
B. kept
C. keeping
D. to keep
答案
答案：C
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The lady walked around the shops, ______ an eye out for bargains. [ ]
A. keep
B. kept
C. keeping
D. to keep
答案：C
）可裂变生成钡（
）和氪（
）。已知
、
、
和中子的质量分别是mu、mBa、mKr、mn，则此铀裂变反应的方程为____________；该反应中一个
裂变时放出的能量为____________。（已知光速为c）