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三北防护林

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禁止使用出现松股、散股、断股、严重磨损的纤维绳。

A. 正确
B. 错误

()是编制测验的中心环节,()是具体体现测验目的的重要内容,也是决定测验好坏的重要方面。

电流是电荷在外力作用下做()运动。

A. 定向无规则
B. 规则的定向
C. 规则但无定向
D. 杂散

Consider the events_% tables in performance Schema. Which two methods will clear or reset the collected events in the tables?()

A. Using DELETE statements, for example, DELETE FROM performance_schema.events_watis_current
B. Using the statement RESET PERFORMANCE CACHE
C. Using the statement FLUSH PERFORMANCE CACHE
D. Using TRUNCATE statements, for example, TRUNATE TABLE performance_schema.events_waits_current
E. Disabling and re-enabling all instruments
F. Restarting Mysql

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