简述酒精生产过程对淀粉原料进行糖化时的主要设备及作用。

The growth of switching has (135) a new generation of network management tools that help (136) cope with the challenges, (137) them to correlate device alarms in order to (138) pinpoint root causes, or to monitor service levels without depending on IP subnet schemes. These new tools have become essential to coping with the primary (139) effect of any treatment that significantly increases network flexibility: added complexity.

139（）

A.technicians 

B.workers 

C.salesmen 

D.professors

下列有关离子大量共存的说法正确的是（　　）

A．H⁺、Fe²⁺、SO₄^2-、NO^-₃因发生氧化还原反应而不能大量共存

B．澄清透明的无色溶液中，ClO^-、MnO₄^-、Al³⁺、SO^2-₄可能大量共存

C．在含大量Fe³⁺的溶液中，NH⁺₄、Na⁺、Cl^-、SCN^-可能大量共存

D．使石蕊试液变红的溶液中，Na⁺、Cl^-、SO^2-₄、HCO₃^-可以大量共存

将下列句子合并成一个含定语从句的复合句。

1. The new library is not far from the school. The library was built two years ago.

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2. The beautiful woman is Linling's mother. We met her at the hotel yesterday.

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3. I have never seen the dolls. She bought them in Paris last year.

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4. She is a nurse. Her work is to take care of the patients.

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5. Books are our good friends. We can learn a lot from them.

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6. We visited the place last winter vacation. Mao Zedong was born in this place.

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7. This is our manager. You talked to her yesterday morning.

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8. Great changes have taken place in China. China is a developing country.

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患者女，25岁。妊娠3个月。因牙龈红肿出血就诊。口腔检查发现DI-S为2，CI-S为0，GI为1，余未见异常。对该患者正确的处理措施是（）

A.口腔含漱剂含漱

B.口服消炎药物

C.口腔卫生指导

D.龈上洁治术

E.龈下刮治术

关于引起催化剂失活的原因，下列属于永久失活的是（）。

A.生焦积碳

B.金属沉积和晶型改变

C.超温

D.有机氮中毒