海船船员考试

单选题Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.A toxicB flammableC explosiveD all of the above

题目
单选题
Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.
A

toxic

B

flammable

C

explosive

D

all of the above

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相似问题和答案

第1题：

Data about () and their () are valuable, especially when that information is carefully analyzed and used to target marketing campaigns.

A、consumers

B、market situation

C、consumption habits

D、buyers


正确答案:A,C

第2题：

You created an encrypted tablespace:You then closed the encryption wallet because you were advised that this is secure.Later in the day, you attempt to create the EMPLOYEES table in the SECURESPACE tablespace with the SALT option on the EMPLOYEE column.Which is true about the result?（）

A. It creates the table successfully but does not encrypt any inserted data in the EMPNAME column because the wallet must be opened to encrypt columns with SALT.

B. It generates an error when creating the table because the wallet is closed.

C. It creates the table successfully, and encrypts any inserted data in the EMPNAME column because the wallet needs to be open only for tablespace creation.

D. It generates error when creating the table, because the salt option cannot be used with encrypted tablespaces.


参考答案：C

第3题：

People begin to understand the natural resources are not () , which can be used up without caution.

A、numerous

B、numerable

C、inexhaustible

D、valuable


参考答案：C

第4题：

A chain bridle is used when towing astern because it ______.

A.is easy to connect

B.provides an effective catenary and absorbs shock due to its weight

C.makes rigging a swivel unnecessary

D.prevents the tow from yawing by the drag of the chains in a seaway


正确答案：B
当拖尾部的时候，锚链被使用，提供有效的下垂曲线，和减缓由于重量引起的震动。

第5题：

Which two are advantages of static routing when compared to dynamic routing?()

A.Security increases because only the network administrator may change the routing tables

B.Configuration complexity decreases as network size increases

C.Routing updates are automatically sent to neighbors

D.Route summarization is compued automatically by the router

E.Routing traffic load is reduced when used in stub network links

F.An efficient algorithm is used to build routing tables,using automatic updates

G.Routing tables adapt automatically to topology changes.


参考答案：A, E

第6题：

Examine the following set of RMAN commands:Which statement is true when the RMAN RUN block Is executed?()

A. The execution of the script fails because multiple channels cannot coexist.

B. The script is executed and both the channels are used for the script execution.

C. The new channel, CHI, is Ignored because a channel has been configured already.

D. ration parameter DC1 is overridden because a new channel is allocated in RMAN RUN block.


参考答案：D

第7题：

In a data warehouse environmem, data is only valuable when it is organized and displayed as(75)

A．data

B．information

C．file

D．document


正确答案：B
解析：在数据仓库环境下，数据以信息的形式来组织或显示时候才是有价值的。

第8题：

Data about consumers and their consumption habits are valuable, especially when that information is carefully analyzed and used to target marketing campaigns.


正确答案：有关消费者及其消费习惯的数据是很有价值的，特别是在对这些信息经过分析之后可以用于目标市场营销活动时。

第9题：

● Since RAM is only active when the computer is on, your computer uses disto store information even when the computer is off. Which of the following itrue? （74）

（74）

A．When your computer is on, only RAM is used to store information

B．When your computer is on, only disk drives are used to storinformation.

C．When your computer is off, only RAM is used to store information

D．When your computer is off, only disk drives are used to storinformation.


正确答案：D

第10题：

Which cleaning product should be used for the inside of a computer？（）

  • A、glass cleaner
  • B、a simple ammonia and water solution followed by an antistatic solution
  • C、a bleach solution followed by water
  • D、compressed air

正确答案:D

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