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单项选择题

根据零件不同的功能要求，给出不同的几何公差项目。为保证机床工作台或刀架运动轨迹的精度，要对机床导轨给出直线度公差要求。
A、正确
B、错误

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单项选择题
What is the logical order of the following paragraph?
The cloning of Dolly involved several steps. First, cells that had previously been taken from Dolly’s mother were starved for five days, which caused them to stop dividing. This interruption of the cells’ division cycle made it easier for them to reprogram themselves to start growing a new organism. After five days, the nuclei of these cells were removed and transferred into an unfertilized sheep egg, from which the natural nucleus had previously been removed. In the next step, the egg was grown in the laboratory for a period of time. Then the egg was implanted into a different sheep, where it grew normally. When the sheep finally gave birth, the lamb was an exact genetic copy, or clone, of the sheep that had provided the transferred nucleus, not of the sheep that had provided the egg.
A．Comparison and contrast
B．Chronological order
C．Cause and effect
D．Logical division of ideas
单项选择题
翻转课堂让老师更密切地联系学生，能更多地指导学生实践。
A、正确
B、错误
不定项选择
我国当前推行社会统筹与个人账户相结合的基本养老保险制度。
A．错误
B．正确
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