When relieving the helm，the new helmsman should know the（）.
A. Course per magnetic steering compass
B. Gyro error
C. Variation
D. Maximum rudder angle previously used
采用钢管作吊灯的吊杆时，钢管内径不得小于（）mm，钢管壁厚度不应小于1.5mm。
A. 6
B. 8
C. 10
D. 12
Which two prerequisites are needed for performing workload capture and replay？（）
A. Close all sessions performing queries using database links
B. running the database in shared server mode
C. The database on which the workload is replayed has to be a restore of the original database to a specific SCN
D. setting up the directory to capture the workload
PCOS月经不调的主要表现是()空蝶鞍综合征的常见症状是()排卵性月经失调常伴有()
A. 月经不调
B. 不孕
C. 闭经
D. 痛经
E. 溢乳
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