测量大容量变压器直流电阻时，所需要的充电时间相当长，而且变压器容量越大，所需充电时间

kV变电所内成套电容器柜（）。

A.单列布置时，网门与墙距离不应小于1.3m

B.当双列布置时，网门之间距离不应小于1.5m

C.单列布置时，柜正面与墙面距离不应小于1.5m

D.当双列布置时，柜面之间距离不应小于2.0m

完形填空（共10小题；每小题２分，满分20分）

阅读下面短文，掌握其大意，然后从21－30各题所给的ABC和D项中，选出最佳选项．

The finest and most sought-after violins were handcrafted by an Italian violin maker over 250 years ago. The man’s name was Antonius Stradivarius. He was born in 1644 and began his career  21  a violin maker’s apprentice (学徒). Working on his own by 1680, he became determined to make   22  that could reproduce tones as rich as those produced by the human voice. He  23    several shapes and styles for his violins until he arrived at a design that pleased him. During his career he crafted 1,100 violins. Those in   24  have become treasured possessions.

Unfortunately, the secret of the Stradivarius violin died with its maker. During his lifetime Stradivarius kept his notes safely   25  , even his two sons, who helped him in his workshop, did not know all the steps involved in each violin’s construction.

Through the years, many experts have offered    26  explanations for the unique tone of a “Strad”. Some say it is due to the violin’s shape. Others suggests that the secret    27  the special properties(特性) of the wood, which Stradivarius obtained from native Italian trees that no longer exist. The most widely accepted explanation is that it is created by the varnish（清漆） that the   28   used to coat his violins. Chemists have analyzed as closely as possible the varnish and have found its   29   has improved the sound of many violins.   30  , no other violin maker has been able to fully reproduce the tone of the Stradivarius’s violins.

21.  A. with                B. as             C. for             D. from

22.  A. Instruments    B. facilities            C. equipment     D. tools

23.  A. investigated     B. surveyed      C. tested          D. experimented

24.  A. fashion             B. existence        C. possession     D. use

25.  A. protected         B. buried        C. hidden        D. covered

26.  A. possible      B. accurate             C. detailed       D. persuasive

27.  A. brings in     B. takes in       C. results in      D. lies in

28.  A. master       B. violinist       C. expert          D. user

29.  A. attention            B. application    C. invention            D. foundation

30.  A. Additionally         B. Luckily        C. Therefore     D. Still

海关是国家的监督管理机关，实施监督管理的范围是进出国境的活动。 ( )

下面说法正确的是（）

A.UNIX系统中有两种NFS服务器，分别是基于内核的NFSDaemon和用户空间Daemon，其中安全性能较强的是基于内核的NFSDaemon

B.UNIX系统中有两种NFS服务器，分别是基于内核的Daemon和用户空间NFSDae-mon，其中安全性能较强的是基于内核的NFSDaemon资

C.UNIX系统中现只有一种NFS服务器，就是基于内核的NFSDaemon，原有的用户空间Daemon已经被淘汰，因为NFSDaemon安全性能较好

D.UNIX系统中现只有一种lYFS服务器，就是基于内核的Daemon，原有的用户空间NFSDaemon已经被淘汰，因为Daemon安全性能较好