滚珠丝杠副的轴向间隙是指丝杠和螺母无相对转动时,丝杠和螺母之间的()。

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问题:

滚珠丝杠副的轴向间隙是指丝杠和螺母无相对转动时,丝杠和螺母之间的()。

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幼儿期年龄的划分应是

A.出生到2岁
B.出生到1岁
C.1~3岁
D.1~4岁
E.2~4岁

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能将模拟信号转换为数字信号的是()

A.探测器

B.准直器

C.阵列处理机

D.A/D转换器

E.D/A转换器

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I am honored to be here today, (1) Harvard at this celebration of the College Board’s half century of working to promote (2) and equal opportunity in higher education.
Before I say anything else, I want to thank everyone in the room for the work you do every day to make college (3) , available, and (4) for millions of young people across the country.
I want to focus my remarks on a matter of (5) to American familiesand to the future of the nation -- restoring education to its proper role as a (6) to equal opportunity and (7) in our society.
This has been an (8) in higher education, with great and creative efforts made by many institutions. Earlier this year, we announced a new (9) at Harvard aimed at the students from families of low and (10) income. Under our new program, families with incomes of (11) will no longer be expected to contribute to the cost of attending Harvard for their children. Families with incomes of less than $ 60,000 will also see their (12) reduced.
We are proud of this effort at Harvard, but we are aware that the programs of individual institutions with means can never be a substitute for our shared (13) to provide adequate funding for Pell grants and other financial aid, and for the state and community college systems that make higher education (14) and affordable for the (15) .
There is something empty about (16) initiatives that may be right for one institution without attention to their broader impact. (17) , we (18) if we urge changes in national policy without doing what we can on our own campuses.
In this spirit, I want to (19) today a problem that is emerging with (20) in this nation.

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统称语“院、校”的通电略号是()。

A、-Y-

B、-X-

C、-YX-

D、-S-

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斯塔米卡帮公司对尿素生产工艺改进最突出的贡献是(),解决了尿素设备的腐蚀问题。

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