测量过程中的随机效应及系统效应均会导致测量不确定度，数据处理_爱下问搜题

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问题判断题

测量过程中的随机效应及系统效应均会导致测量不确定度，数据处理中的修约也会导致不确定度。

答案

参考答案：对

阅读理解

阅读理解。

Steve Jobs was one of the fathers of the personal computing time and the founder of Apple. He was also one of the giants of the information age. Here are some of his greatest contributions.

Apple II Jobs and Steve Wozniak founded Apple Computes Inc. in 1976. A year later, the Apple II was invented. This production (产品) was the world's first mass-market personal computer.	Apple II Jobs and Steve Wozniak founded Apple Computes Inc. in 1976. A year later, the Apple II was invented. This production (产品) was the world's first mass-market personal computer.
Apple II Jobs and Steve Wozniak founded Apple Computes Inc. in 1976. A year later, the Apple II was invented. This production (产品) was the world's first mass-market personal computer.	Apple II Jobs and Steve Wozniak founded Apple Computes Inc. in 1976. A year later, the Apple II was invented. This production (产品) was the world's first mass-market personal computer.

1. When did the iMac first come out?

A. In 1976.
B. In 1998.
C. In 2010.
D. In 2011.

2. Which one was the oldest?

A. The Apple II.
B. The iMac.
C. The iPad.
D. The Iphone 4s.

3. From the passage, we can know that the iPad ______.

A. has a better camera.
B. is the first personal computer.
C. has a CD-ROM slot.
D. is great for watching movies.

问答题

滑动轴承的接触角和接触面如何检查？