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物联网信息处理技术包括信息存储和分析技术、（）和（）。

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按系统应用的业务领域分类，物流信息管理系统分为（）信息系统和（）信息系统。

As a sales person, ______ John lacks is self-confidence when he is talking with clients.

A. which
B. what
C. why
D. that

The more satisfied your employees are, the more they will contribute ______ your company.

A. on
B. about
C. with
D. to

John spent a lot of time ______ to his collegues how challenging the project was.

A. explain
B. explaining
C. to explain
D. explained