排水器

工件与试块表面耦合损耗dB差值称为表面衰减。

近代一位历史人物认为：“盖自三权鼎立之说出，以国会立法，以法官司法，以政府行政，而人主总之……人主尊为神圣，不受责任，而政府代之。”这描述的是[ ]

A、君主专制

B、民主共和

C、君主立宪

D、中体西用

As time goes on, I am no longer young, I have friends whose mothers have passed away.  I have heard these sons and daughters say they never fully appreciated their mothers   1   it was too late to tell them. I am blessed with the dear mother who is still alive. I   2   her more each day. My mother does not change, but I   3  . As I grow older and wiser, I realize   4   an extraordinary' person she is. How   5   that I am unable to speak these words in her   6 , but they flow easily from my pen.

As a daughter, how to thank her mother for life itself?? For the love, patience and just   7   hard work that go into   8  a child? For running after a toddler (学走步的小孩), for understanding a   9   teenager, for tolerating a college student who knows  10 ? For waiting for the day when a daughter   11   how wise her mother really is?

How does a   12   woman thank a mother for   13   to be a mother? For being ready   14   advice when asked or remaining   15   when it is most appreciated? For not saying, “I told you so,” when she could have said these words  16  ? For being  17  herself-loving, thoughtful, patient, and forgiving? I don' t know how, dear God, except to ask you to bless her as richly as she   18   and to help me live up to the example she has   19 . I pray that I will look as good in the eyes of my children as my mother   20   in mine.

1．A．as             B．that           C．until               D．when

2．A．approve        B．appreciate     C．need               D．resemble

3．A．do             B．have           C．did              D．will

4．A．how            B．that          C．who               D．what

5．A．sad             B．glad           C．comic              D tragic

6．A．absence          B．presence       C．appearance         D．existence

7．A．common        B．plain          C．normal            D．usual

8．A．raising          B．rising           C．developing         D．training

9．A．childish         B．energetic      C．fearless            D．moody

10．A．anything       B．something     C．everything          D．nothing

11．A．detects        B．discovers      C．recognizes          D．realizes

12．A．pretty         B．foolish         C．green           D．grown

13．A．failing        B．intending      C．continuing         D．keeping

14．A．by          B．with           C．for                D．on

15．A．silent        B．quiet          C．cool               D．noiseless

16．A．dozen times   B．a dozen of times C．dozens of times   D．dozen of time

17．A．valuably     B．essentially     C．naturally           D．actually

18．A．devotes      B．deserts        C．deserves            D．desires

19．A．set         B．settled          C．placed             D．fixed

20．A．sees         B．finds           C．is                 D．looks

对物品进行ABC分类后，实施重点控制，哪一类物资应该严密控制？（）

A.A

B.B

C.C

D.D

关于类毒素正确的是（）

A.有免疫原性，无毒性

B.没有免疫原性，有毒性

C.其性质很不稳定

D.没有免疫原性也没有毒性

E.能中和毒素的毒性