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单选题When is it advisable to dump the waste toner from a technicians service vacuum？（）A When it is full.B It is not recommended.C Before performing preventative maintenance.D After each call.

题目
单选题
When is it advisable to dump the waste toner from a technicians service vacuum？（）
A

When it is full.

B

It is not recommended.

C

Before performing preventative maintenance.

D

After each call.

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相似问题和答案

第1题：

When Mr. Westhusin says “... cloning is dangerous,” he implies that _____.

［A］ lab technicians may be affected by chemicals

［B］ cats and dogs in the lab may die of diseases

［C］ experiments may waste lots of lives

［D］ cloned animals could outlive the natural ones


正确答案：C

 本题考查句意的理解。题干引用的话出现在第二段末。其上文即该段倒数第二句中，威斯苏森先生指出，在猫或牛的克隆试验中，对动物卵的浪费以及许多动物的自然性流产都可以接受，但是克隆人就不行。因此可知，［C］是“危险”的真正含义。其他项文中都未提及。

第2题：

27． Ann-s mother died ____________ ．

A． before she was born

B． after she was born

C． when she grew up

D． when her sister was born


正确答案：B
27．B【解析】见文章第四句“His wife died after his on- ly daugher was born"可知此处的his only daughter 就是Ann。Ann的母亲在她出生后就死了。

第3题：

You perform the following activities during the database upgrade from Oracle Database 10g to Oracle Database 11g:1. Capture plans for a SQL workload into a SQL Tuning Set (STS) before upgrade.2. Load these plans from the STS into the SQL plan baseline immediately after the upgrade.What is the reason for performing these activities? （）

A. to minimize plan regression due to the use of a new optimizer version

B. to completely avoid the use of new plans generated by a new optimizer version

C. to prevent plan capturing when the SQL statement is executed after the database upgrade

D. to keep the plan in the plan history so that it can be used when the older version of the optimizer is used


参考答案：A

第4题：

When do sailors make the ship fast? （）

  • A、When a ship is unmooring.
  • B、After a ship is in position alongside a wharf.
  • C、Before a ship is loading.
  • D、A and C

正确答案:B

第5题：

It′ s a long time __________ I saw youlast.
--Yes, and what a pity! It will be a longtime __________ we see each other again.

A.since; before
B.when; since
C.before; when
D.before; since

答案：A
解析：
考查连词：①It+is／has been+一段时间+since(自从……起)+sb．／sth．did；．②It+was／will be+一段时间+before(多久之后才)+sb．／sth．did／do；③时间状语从句：It+was+具体钟点+when(当……时)+ sb．／sth．did；④强调结构：It+was+介词+具体钟点+that+sb．／sth．did。句意为“——自从上次见你，已经有很长一段时间了。——是的，遗憾的是，还要很长一段时间我们才能再相见。”

第6题：

When did Lisa become conscious again?

A. When the train was leaving.

B. After she was back on the platform.

C. After the police and fire officials came.

D. When a man was cleaning the blood from her head.


正确答案：B
【解析】细节理解题。由倒数第三段的It was hard to lift her. She was just out. But he managed to raise her the four feet to the platform. so that bystanders could hold her by the grins and drag her away from the edge. That was where Lisa briefly regained consciousness可知。

第7题：

In launching a lifeboat, when should the tricing pendants be released?______.

A.Before the boat is lowered from the stowage position

B.As soon as the boat-fall blocks clear the davit head

C.After the limit switch is activated

D.After all people have been embarked


正确答案：D
在施放救生艇过程中，什么时候控制索应被解开？在所有人员登船以后

第8题：

Scientists say it may be five or ten years _____ it is possible to test this medicine on human patients.

(A) since (C) after

(B) before (D) when

 

 


选B
之前
科学家说这个药想在病人身上试验，还要等个5到10年。。。


第9题：

A) when B) if C) after D) before


答案：A
解析：

第10题：

When will the primary processor core dump run in case of a switchover？（）

  • A、never takes place
  • B、periodically
  • C、during switchover
  • D、after switchover
  • E、before switchover

正确答案:D

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