题目内容

在电动调距桨式艏侧推装置的液压系统中,伺服活塞在两侧压差作用下的移动,是通过()驱动桨叶回转的。

A. 锥齿轮传动机构
B. 曲柄滑块机构
C. 涡轮蜗杆机构
D. Z型传动机构

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The database is configured in ARCHIVELOG mode and regular complete database backups are taken. Theloss of which two types of files may require a recovery with the RESETLOGS option? ()(Choose two)

A. Control files
B. Password files
C. Inactive online redo log file
D. Archived log files required to perform recovery
E. Newly created tablespace which is not backed u

试述植被建设对防治荒漠化意义?

往复式压缩机排气压力范围广,从低压到()都适用。

正常运行时制动隔离开关应打正常位;不允许关闭GYK,如果关闭,GYK将自动实施()。

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