在原子吸收分光光度法中,当吸收为1%时,其吸光度为( )。A.-2 B.2 C.0

题型:单项选择题

问题:

在原子吸收分光光度法中,当吸收为1%时,其吸光度为( )。

A.-2

B.2

C.0.01

D.0.0044

考点:化学检验工高级化学检验工高级
题型:单项选择题

小红在一次考试中作弊,被老师发现了,老师狠狠地批评了她,事后,小红总是随身带着那张违纪的考试卷,以此来督促自己努力学习遵守纪律,这是________的表现。[ ]

A、自卑

B、自负

C、知耻

D、虚荣

题型:单项选择题

Mrs. Janes gave music lessons at a school.She had a good voice and enjoyed singing, except that some of her high tones sound like a gate that had forgotten to oil.Mrs. Janes knew her weakness well, and took every chance she could find to practise these high notes. As she lived in a small house, where she could not practise without disturbing the rest of the family, she usually went for long walks along the country roads whenever she had time and practised her high notes there.Whenever she heard a car or a person coming along the road, she stopped and waited until she could no longer be heard before she started practicing again, because she was a shy person.

One afternoon, a fast, opened car came up behind her so silently and so fast that she didn’t hear it until it was only a few yards from her.She was singing some of her highest and most difficult tones at that time and as the car passed, she saw an anxious expression came over the driver’s face.He stopped his car suddenly, jumped out and began to examine all his tyres carefully.

Mrs. Janes didn’t dare to tell him what the noise he had heard really was, so he got back into the car and drove off.

小题1:How did Mrs. Janes sing?

A.She sang well, but she didn’t practise singing hard.

B.She enjoyed singing, but she had a terrible voice.

C.She was a good singer, but she could not sing the high tones well.

D.She sang terribly, she was no singer at all.小题2:Why did she go for long walks along the country roads?

A.Because she enjoyed the country’s fresh air.

B.Because she was afraid to disturb the rest of the family.

C.Because she lived in a small house far away.

D.Because she was afraid to practise the high tones.小题3:Why did the driver stop his car suddenly and jump out of it?

A.Because he supposed something must have gone wrong with his car.

B.Because he was moved by the pretty voice of Mrs. Janes.

C.Because he wondered what had happened to Mrs. Janes.

D.Because he frightened by the terrible voice of Mrs. Janes.

题型:单项选择题

水液在相邻细胞的细胞壁和细胞质中运行的途径是共质体途径。()

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何谓下颌边缘运动

A.正常的开闭门运动

B.下颌向各个方向所能作最大范围运动

C.下颌侧向运动

D.下颌前伸运动

E.下颌的习惯性开闭口运动

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