题干
With the help of computers, people will find it easier to keep the traffic smoothly.
A：to run
B：run
C：running
D：are running
答案(点此获取答案解析）
C
With the help of computers, people will find it easier to keep the traffic smoothly.
A：to run
B：run
C：running
D：are running
和
的单色光照射同一金属板，逸出光电子的最大初动能之比为1：2．以h表示普朗克常量，c表示真空中的光速，则此金属板的逸出功为（ ）