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【单选题】
关于叶片式泵与风机,以下说法正确的是:( )A.
叶片式泵与风机叶轮,叶轮上却没有叶片
B.
叶片式泵与风机叶轮,但叶轮上不一定布置有叶片
C.
叶片式泵与风机叶轮,叶轮上均布置有叶片
D.
叶片式泵与风机不一定有叶轮,也不一定有叶片
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反馈参考答案：
举一反三
【单选题】What is the passage mainly about?
A.
How to get rid of stress.
B.
What stress means.
C.
How to understand stress.
D.
How to avoid stress.
【单选题】Though it was midnight, she found her daughter sitting at the dest, completely ________ her homework.
A.
absorbing in
B.
absorbed in
C.
absorbing into
D.
absorbed into
【单选题】What will be the result of the following configuration？（） Log_archive_dest_1=location=c：/oracle/arch/mydb Log_archive_dest_2=location=z：/oracle/arch/mydb
A.
An error will occur during database startup because the second parameter is not valid.
B.
An error will occur during database startup since you are trying to create archived redo logs in two different locations.
C.
Archived redo logs will be created in two different locations by the ARCH process.
D.
Archived redo logs will be created in two different locations by the LGWR process.
E.
Neither parameter setting is valid， so the database will not start up.
【简答题】信息系统维护的类型包括:正确性维护、 ( ) 、 ( ) 和预防性维护。
【单选题】如图所示，所有设备运行在MPLS网络中，下游交换机SWA发现1.1.1.1的标签映射消息给SWB，SWB收到下游交换机SWA分发的标签后给SWC分发标签，SWC收到SWB发来的标签后再发给SWD发送标签。则该网络中的标签控制方式和标签分发方式分别为（）。
A.
Ordered+DU
B.
Ordered+DoD
C.
Independent+DU
D.
Independent+DoD
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