太阳能电池之所以是一种特殊的(),是因为其本质就是一个具有单向导电特性的半导体PN结

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问题:

太阳能电池之所以是一种特殊的(),是因为其本质就是一个具有单向导电特性的半导体PN结。

A、光电二极管

B、光电三极管

C、发光二极管

D、发光三极管

考点:装卸机械电器修理工装卸机械电器修理工技师装卸机械电器修理工技师题库
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阅读理解,选择正确答案。

      I am Jack. I live near our school. So I can go to school on foot. But sometimes I go by bike. Because it's

so much fun. My father works in our school. We go to school together. On the weekends, I often play with

my friend, Mike. We usually play ping-pong, sometimes we play chess. This weekend, I'm going to visit my

grandparents. Because it's my grandma's birthday.

1. Jack usually goes to school _____________.

A. on foot

B. by bike 

2. Jack's mother lives _____________.

A. in the school

B. near the school

3. Jack goes to school with _____________.

A. his father

B. his friend, Mike

4. Jack and Mike usually _____________.

A. play chess

B. play ping-pong

5. Whose birthday is this weekend?

A. Grandfather's

B. Grandmother's

题型:单项选择题

确定资产类别收益预期的计算公式是()

A.历史数据法

B.情景综合分析法

C.截面分析法

D.因素分析法

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什么是湿球温度

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工人用如图所示的滑轮组提升重物,工人用360N拉力将重600N的重物匀速提升10m,需要时间50s.请根据提供的信息,计算四个相关的物理量.(g=10N/kg,不计绳重及摩擦)要求先列出所求物理量再求解.

题型:单项选择题

投标人在有些情况下会采取不平衡报价法,不包括( )

A.工程量核算不明确
B.业主已决定是否实施暂定项目
C.采用单价包干混合制合同
D.招标文件要求某些子项报“单价分析表”

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