问题 问答题 简答题

空罐灭菌的灭菌条件是什么?连续灭菌的温度和时间通常是多少?

答案

参考答案:

条件:

(1).内部结构合理,焊缝及轴封装置可靠,蛇管无穿孔现象的发酵罐;

(2).压力稳定的蒸汽;

(3).合理的操作方法。

温度:90~96℃±1℃。

时间:10~90分钟可调。

阅读理解

第二部分:阅读理解(共20小题;每小题2分,满分40分)

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。

Alice always wanted to be a singer. Music was the most important thing in her life and, to tell you the truth, she took lessons for years, and practised every day, but in spite of all this, her voice didn’t improve. Honestly, it didn’t get better, it just got louder.

Her teacher finally gave up and stopped the lessons, but Alice refused(拒绝)to give in, and one day she decided to give a concert and invited her teacher to attend.

The teacher was very worried about what to say after the concert. She knew it would be terrible and it was. She didn’t want to tell a lie, but she didn’t want to hurt Alice’s feelings, either. Finally, she got an idea and went backstage (后台) to greet her pupil.

“Well,” said Alice, “what did you think of my singing?”

“My dear,” said the teacher, “you’ll never be better than you were tonight.”

46. Alice wanted to be a singer because she       .

A. was good at singing

B. could do nothing but sing

C. had a good teacher

D. was most interested in music

47. Alice’s teacher stopped the lessons because     .

A. Alice didn’t make any improvement in singing

B. Alice’s voice became louder and louder

C. Alice didn’t work hard enough

D. Alice was so proud and wouldn’t listen to her

48. What made Alice decide to give a concert?

A. She wanted to prove that her teacher was wrong.

B. She wanted to please her teacher.

C. She was sure that she could sing beautifully.

D. Somebody else wanted her to do so.

49. What is really meant by saying “You’ll never be better than you were tonight.”?

A. You gave a wonderful concert tonight.

B. You won’t make any improvement in future.

C. You have never sung so well before.

D. You did much better before than tonight.

多项选择题