In some cases, there is no data in the database corresponding to the requested bean; the container returns a null, as there is no bean matching the client's request.
有些情况下，数据库中并没有与请求的bean对应的数据；则容器返回空，因为没有bean与客户机的请求匹配。
The pole terminal matching with the radius of a leakage container is utilized to stop the leak, and a gap between the pole terminal and the leakage container is controlled in a preset range.
采用与泄露容器半径相匹配的极靴进行堵漏，能保证了极靴与泄漏容器间的气隙控制在预定范围内。
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