单相交流调压器对于电感性负载，控制角α的移相范围为0°～180°
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变电（换流）站土建工程分项工程质量验收合格应符合哪些规定？
Your database is running in NOARCHIVELOG mode. You want to put the database in ARCHIVELOG mode. Which two statements regarding archive log destinations are true？（）
A. The destination must be global only.
B. A maximum of five destinations can be assigned.
C. A maximum of ten different destinations can be assigned.
D. All the destinations are determined by the server automatically.
E. The destination may be local or remote for a Standby Database.
F. The destination can be changed by setting the LOG_ARCHIVE_FORMAT initialization parameter.
win系统和unix系统对应V2安装包一样。
A. 正确
B. 错误
PPB塑料管其耐高温性能优于PPR塑料管。
A. 正确
B. 错误
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