男性，47岁，头痛发病，病程4个月，入院前出现左侧肢体无力和呕吐。入院检查，意识清，

二甘醇是齐齐哈尔第二制药公司假药事件的“元凶”．若用X表示二甘醇的化学式，则它在空气中燃烧的化学方程式为：X+5O₂ 

点燃  .

 4CO₂+5H₂O，由此推断二甘醇的化学式是（　　）

A．C₄H₁₀

B．C₄H₁₀O₈

C．C₄H₁₀O₃

D．C₄H₁₀O₁₃

  Annealing is a way of making metal softer by heating it and then letting it cool very slowly. If metal is heated and then cooled very quickly, for example by dipping (浸) it in water, it will be very hard but also very brittle (脆) —that is , it will break easily. Metal that has been annealed is soft but does not break as easily. It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly for a certain length of time. The longer the heated metal takes to cool slowly, the softer it becomes. Annealing can also be used on other materials, such as glass.

小题1: Annealing can make metal      

A．hard and tough (韧).

B．hard but brittle.

C．soft but tough.

D．soft and brittle.小题2:Why do people put hot metal in water?

A．To make it hard.

B．To make it soft.

C．To make it cool.

D．To make it brittle.小题3:As suggested by the text, how can glass be made less brittle?

A．It can be heated and then cooled quickly.

B．It can be cooled and then heated slowly.

C．It can be heated and then cooled slowly.

D．It can be cooled and then heated quickly.

唾液中的主要消化酶是（）。

A.凝乳酶

B.蛋白水解酶

C.淀粉酶

D.肽酶

E.寡糖酶

根据我国企业所得税法的规定，下列哪些经营者应当缴纳企业所得税（）。

A.合伙企业

B.独资企业

C.个体工商户

D.股份制企业

一般的爆破片装置应在（）年内更换，制造单位明确可延长使用寿命的除外。