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问题 单项选择题 A1/A2型题

下面射线不属于高LET射线的是（）。

A.质子射线

B.碳离子射线

C.γ射线

D.中子射线

E.Α粒子

答案

参考答案：C

解析：线性能量传递(LET)是用于描述在粒子轨迹上电离的密度。X射线和γ射线属于低LET射线，而质子、中子、碳离子和a粒子属于高LET射线。

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When you finish high school or university, is learning done? The answer is “no”. In many countries, people continue learning all their lives. 小题1:____ is lifelong(终身的) learning important? How can it help you?

You go to school and learn. You study. You take tests. 小题2:____ learning doesn’t only happen in school. Learning doesn’t小题3:_____ when you graduate from high school or college. You are learning all the time. For example, learning can 小题4:___ when you go to a museum. It can 小题5:____ happen when you get a job. You learn when you 小题6:_____ sports or when you take a trip. 小题7:_____ is life! We never stop learning. Every day you can improve yourself by learning something 小题8:_______.

Let’s look at one example of lifelong learning in Japan. In Japan, lifelong learning is very important. People in Japan like to try new learning activities. Music, calligraphy(书法) and foreign languages are some of their 小题9:_____ classes.

When we graduate from school, we should 小题10:____ on learning. Make lifelong learning one of your goals!
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单项选择题

某合伙企业的合伙人共4人，合伙协议中规定合伙人甲为合伙执行人，对外代表合伙企业，其他合伙人不再执行合伙企业事务。合伙人乙某日以合伙企业的名义与某不知情的公司订立合同，对此合同的效力以下分析正确的是：

A．有效

B．无效

C．经全体合伙人追认后生效

D．经合伙执行人追认后生效
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