在JSP中，只有一行代码：${1+2}，运行将输出（）。
A. 1+2
B. 3
C. null
D. 没有任何输出，因为表达式是错误的
A customer stores environmental settings in the deployment descriptors of an application. Whenever they promote the application version from testing to the production environment, they need to open the archive and modify the deployment descriptor. This process is against their security policy. What approach should you recommend to leverage WebLogic features such that they do not have to modify the application archive for different environments?（）
A. Keep environmental data in the global settings of domain and the application can read it from the domain where it runs.
B. Keep environmental data in Deployment Plan XML files. It allows you to change parameters in the deployment descriptor without opening the archive file.
C. Keep environmental data in the database because it is the most effective way of parametrizing the environment.
D. Keep archive in exploded format so the customer does not have to open the archive files.
Eliminate all environmental settings from the application. There should not to be any environmental settings in the application.&e
避雷器交接试验验收中，直流参考电压实测与出厂值比较，变化不应大于（）%。
A. 5
B. ±5
C. 10
D. ±10
根据《建筑施工工具式脚手架安全技术规范》（第7.4.6条），下列说法正确的是（）
A. 拆卸的门架与配件、加固杆等先集中堆放在未拆架体上
B. 及时检查、整修与保养拆卸的门架与配件
C. 门架与配件应按品种、规格分别存放
D. 质量较轻的配件可以抛投至地面
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