技工用微型电机的微型电机部分可分为有铁芯,无铁芯和无碳刷三种,有铁芯和无铁芯的

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问题:

技工用微型电机的微型电机部分可分为有铁芯,无铁芯和无碳刷三种,有铁芯和无铁芯的结构基本相同,他们与无碳刷的结构相差很大

同有碳刷式微电机相比,对无碳刷式微电机的优点描述最准确的是

A.无火花

B.无火花,易发热

C.无火花,转子惯性大

D.无火花,电机效率高

E.无火花,电磁干扰小

考点:口腔五官科主治医师口腔颌面基础知识中级口腔主治医师口腔颌面外科学基础知识3
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收入汇缴账户除向其基本存款账户或预算外资金财政专用存款账户划缴款项外,只收不付,不得支取现金。 ( )

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给下列的问句选择合适的答语。
( ) 1. Can I have some fish?
( ) 2. Can I help you?
( ) 3. What would you like?
( ) 4. I like Chinese food.
( ) 5. How much is it?
A. Yes, please.
B. It's twelve yuan.
C. Sure, here you are.
D. I'd like some orange juice.
E. Me too.
题型:单项选择题

经过近30年的改革开放,我国综合实力和国际竞争力大幅跃升,到2008年,进出口总额已位居世界第三位,经济总量跃至世界()位。

A.第一

B.第二

C.第三

D.第四

题型:单项选择题

风蚀荒漠化是在风力侵蚀作用下,使土壤及细小颗粒被()、()、()、(),造成地表出现风沙活动为主要标志的土地退化。

题型:单项选择题

TCP/IP (71) layer protocols provide services to the application (72) running on a computer. The application layer does not define the application itself, but rather it defines (73) that applications need — like the ability to transfer a file in the case of HTTE In short, the application layer provides an (74) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP (75) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

A. application B. sessionC. physical D. transport

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