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问题 多项选择题

在中国沿海水域从事钻探、开发作业的外国籍钻井船、移动式平台的所有人或者经营人，应向船舶检验机构申请哪些检验（）

A、作业前检验

B、作业期间的定期检验

C、初次检验

D、建造检验

答案

参考答案：A, B

单项选择题

Bluetooth is a universal radio interface in the (71) frequency hand that enables portable electronic devices to connect and communicate wirelessly via short-range, ad hoc networks. Each unit can simultaneously communicate with up to (72) other units per piconet. Moreover, each unit can simultaneously (73) to several piconets. Eliminates the need for wires, cables and connectors for and between cordless or mobile phones, modems, headsets, PDAs, Computers, printers, projectors, local area networks, and so on, and paves the way for new and completely different devices and applications. Technology Characteristics (74) symbol rate exploits maximum available (75) bandwidth。

A．messages

B．certificates

C．applets

D．channel
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填空题

将y=2x2-12x-12变为y=a（x-m）2+n的形式，则m•n=______．
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