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试述根据金属蜗壳外围混凝土结构的受力情况，金属蜗壳的埋入方式主要有哪几种型式？各有什么特点？

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微笑曲线是一条类似微笑嘴型的曲线，中间下凹，两端上翘，通常用来形容制造业的产业链条。在其中，制造产业应朝曲线的两端发展，在核心技术和（）上多下功夫

A. 制造研发
B. 品牌效应
C. 推广宣传
D. 营销服务

A user uses both a Microsoft Windows Mobile 5.0 Smartphonebased device and a Microsoft Windows Mobile 5.0 Pocket PC Phone Edition device for Over-The-Air （OTA） e-mail. Both devices have Microsoft Messaging and Security Feature Pack installed. A remote wipe command is issued against the Pocket PC device. The user reconfigures the ActiveSync settings on the Pocket PC device. When the user attempts synchronization， the device hard-resets again. You need to ensure that the user can synchronize the Pocket PC device. What should you do？（）

A. Cancel the remote wipe issued against the Pocket PC device.
B. Instruct the user to configure only one device for ActiveSync.
C. Instruct the user to perform a soft-reset of the Pocket PC device.
D. Instruct the user to perform a manual hard-reset of the Pocket PC device.

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You run the SQL Tuning Advisor (STA) to tune a SQL statement that is part of a fixed SQL plan baseline. The STA generates a SQL profile for the SQL statement, which recommends that you accept the profile. Which statement is true when you accept the suggested SQL profile?（）

A. The tuned plan is not added to the SQL plan baseline.
B. The tuned plan is added to the fixed SQL plan baseline as a fixed plan.
C. The tuned plan is added to the fixed SQL plan baseline as a nonfixed plan.
D. The tuned plan is added to a new nonfixed SQL plan baseline as a nonfixed plan.

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在普通数控机床上加工零件，应尽量选用（）装夹工件。

A. 成组夹具
B. 随行夹具
C. 组合夹具
D. 通用夹具
E. 专用夹具

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