耳蜗内毛细胞基底侧膜中电压门控钙通道开放，引起Ca2+内流的作用是（）
A. 形成感受器电位
B. 平衡细胞内电位
C. 触发基底膜递质释放
D. 参与信号级联传递
E. 促进胞内生化反应
What does the minimize load database parameter mean when backing up a database?（）
A. RMAN will attempt to make the backup run as fast as possible without any IO limitations.
B. RMAN will automatically restrict the number of channels in use to one.
C. RMAN will spread the backup IO over the total duration stated in the backup command.
D. RMAN will skip any datafile that currently is involved in an IO operation. RMAN will retry backing up the datafile later and an error will be raised at the end of the backup if the datafile cannot be backed up.
E. Datafiles will be backed up; those having the lowest current number of IO operations will be backed up first.&e
A customer is concerned about the high energy cost associated with their data center. Specifically， their concern focuses on the cooling cost of many hundreds of servers. You have a meeting with the CIO and CFO to propose a solution. How would you prepare yourself for the meeting？ （）
A. Since their capacities and usage models vary， ask the customer to turn off some of the servers during off-peak and low demand time.
B. Investigate their expansion plans and suggest to the customer the removal of some of their servers to another location and retirement of the older servers.
Contact the CFO to find out the targeted energy savings of the company and propose to the customer the purchase of a more efficient cooling system.
D. Contact the CIO for a list of servers and type/model numbers. Complete a proposal outlining the savings on energy cost by deploying an IBM BladeCenter solution and total cost of ownership and return on investment.
两平行线间的交叉渡线，线间距大于或等于5.1m时，单开辙叉理论中心与锐角辙叉理论中心之间沿线路纵向方向的距离较大，两辙叉可分别设置各自的护轨时，应分别设置护轨。
A. 正确
B. 错误
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