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【单选题】
战术计划一般由下列哪个管理层级制定?A.
高层管理者
B.
中层管理者
C.
基层管理者
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反馈参考答案：
举一反三
【单选题】During virtual reality operations, the surgeon can have a better view of the cuts in the body because ________.
A.
he is looking at the cuts on a computer screen
B.
the cuts can be examined from different angles
C.
the cuts have been highly magnified
D.
he is wearing 3-D glasses
【简答题】Access中的参照完整性规则不包括（ ）。 A)删除规则 B)插入规则 C)查询规则 D)更新规则
【单选题】During virtual reality operations, the surgeon can have a better' view of the cuts in the body because
A.
he is looking at the cuts on a computer screen
B.
the cuts can be examined from different angles
C.
the cuts have been highly magnified
D.
he is wearing 3-D glasses
【简答题】由于直流电弧比交流电弧更难以熄灭,故直流接触器多采用( )灭弧装置和( )灭弧罩。
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