用氢化物-非色散原子荧光法测定土壤中砷时,样品用硝酸-高氯酸消解后为何加入硫脲和盐酸

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问题:

用氢化物-非色散原子荧光法测定土壤中砷时,样品用硝酸-高氯酸消解后为何加入硫脲和盐酸?

考点:环境监测上岗考试环境空气采样环境空气采样题库
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发行二手车贷款的金额不得超过借款人所购汽车价格的( )。

A.40%

B.50%

C.60%

D.80%

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第三节完形填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将选项涂黑。

Why did I come today? I wondered. My feet ached almost as much as my head.  My Christmas    21   contained several people that claimed they needed nothing but I knew their feelings would be hurt   22 I bought them something, so gift buying was   23  but fun.

Hurriedly, I finished shopping and   24  the long checkout lines. In front of me were a boy of about five and a younger girl. She carried a beautiful pair of    25  slippers. When we finally  _ 26  the checkout register, the girl   27  placed the shoes on the counter. She treated them as though they were a    28  .

“That will be $ 6.09,” the cashier said. The boy    29  his pockets. He finally came up with $ 3.12. “I guess we will have to put them back,” he bravely said. “We will come back some other time, maybe tomorrow.” With that statement, a soft  30  broke from the little girl. “But    31   would have loved these shoes,” she cried.

“Well, we’ll go home and work some more. Don’t cry. We’ll surely   32  ,” he said. Quickly I handed $ 3.00 to the cashier. These children had waited in line for a long time. And,   33   , it was Christmas. Suddenly a pair of arms came around me and a small voice   34    said, “Thank you, lady.” “What did you  35  when you said Jesus would like the shoes?” I asked. The boy answered, “Our mommy is sick and going to   36  . Daddy said she might go before Christmas to be with Jesus.” The girl spoke, “My Sunday school teacher said the streets in heaven are shiny gold, just like these shoes. Won’t mommy be 37  walking on those streets in these shoes?”

My eyes   38  as I looked into her tear-stained face. “Yes,” I answered, “I am   39   she will.” Silently I thanked God for using these children to   40  me of the true spirit of giving I once was familiar with.

21. A. plan                   B. list                           C. goods                       D. purchases

22. A. unless                 B. because                  C. if                           D. since

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

24. A. waited                B. joined                      C. attended                   D. gathered

25. A. cotton                 B. leather                     C. gold                         D. silver

26. A. approached         B. got                          C. checked                    D. found

27. A. immediately        B. hesitantly                C. shyly                       D. carefully

28. A. gift                    B. treasure                    C. life                          D. prize

29. A. opened               B. touched                    C. reached                           D. searched

30. A. tear                           B. sob                          C. smile                       D. sigh

31. A. mommy              B. daddy                      C. we                           D. Jesus

32. A. leave                  B. come                      C. return                             D. arrive

33. A. above all             B. at last                       C. at least                     D. after all

34. A. gratefully            B. sweetly                           C. gracefully                        D. kindly

35. A. request               B. expect                      C. mean                      D. attempt

36. A. hospital              B. tomb                        C. heaven                            D. sky

37. A. equal                  B. comfortable              C. convenient                D. beautiful

38. A. pained                B. wetted                      C. shut                         D. froze

39. A. sure                    B. afraid                       C. glad                         D. confident

40. A. inform                B. warn                        C. cure                         D. remind

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营业时间内,某种食物售罄,怎么办?

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行政许可听证由本案的调查人员主持。

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急性化脓性骨髓炎特征性X线表现是()

A.骨质破坏

B.死骨形成

C.骨质增生

D.软组织窦道形成

E.骨膜反应

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