在“食物中含有蛋白质、淀粉和脂肪”的实验中,揉挤面团会掺出白色物质,如何检验这种

题型:选择题

问题:

在“食物中含有蛋白质、淀粉和脂肪”的实验中,揉挤面团会掺出白色物质,如何检验这种物质是淀粉(  )

A.向变白色的清水中滴加碘液,看液体是否变蓝

B.向变白色的清水中滴加红墨水

C.取小块面团放在酒精灯上燃烧,看是否有灰白色物质产生

D.取小块面团在白纸上挤压,看是否留下明显的油斑

考点:观察实验:观察种子的结构
题型:选择题

女性患者50岁,发现乙肝肝硬化2年,近1个月来右上腹隐痛,腹涨,乏力,食欲不振。检查发现巩膜、皮肤黄染,肝大,质硬,腹水阳性。

如患者妇科检查正常,要确诊为原发性肝癌的AFP升高应持续()

A.2周

B.3周

C.4周

D.6周

E.8周

题型:选择题

患者,女,52岁,5年前患乳腺癌手术治疗,术后化疗半年余。半年前发现在左锁骨上淋巴结肿大,2个月来出现胸闷、气短而就诊。化验检查:Hb109g/L, WBC6×109/L,ESR 40mm/h,X线胸片显示右肺肿块阴影,心影向两侧扩大,心脏冲动减弱。

对确诊最墒单易行的方法是

A.心电图

B.X线胸片

C.超声心动图

D.体格检查

E.心包穿刺

题型:选择题

行气管内插管术的情况包括()

A.急性会厌炎引起喉阻塞

B.颈部肿块压迫喉气管引起呼吸困难

C.呼吸功能衰竭,需进行人工呼吸者

D.哮喘引起呼吸困难者

E.新生儿喉阻塞引起呼吸困难

题型:选择题

People like to look in the mirror often when they have a young and beautiful face. However, when one grows old, nobody wants to see their wrinkled old face in the mirror any more. So, many old people seldom look at their faces in the mirror. This is completely wrong.

According to Wu Zhenyun, a professor from the Psychological Research Institute under the Chinese Academy of Sciences, a person’s willingness to look in the mirror can reflect his or her mentality. When people don’t care too much about their age, they will try to carry themselves with ease and natural poise (姿态). They don’t mind looking in the mirror to see their own faces. Some people even love to look in the mirror from time to time to see whether they keep a good appearance. In this way, mirror becomes their best friend that help them to look confident.

On the other hand, some people are afraid of being old. They don’t want to see the wrinkles on their face and their hair turning grey. So they don’t want to look in the mirror. This actually reflects a negative attitude they hold towards life. In the long term, they might suffer from psychological pressure or some sort of depression, which is actually not a wise act.

“ Everyone can make themselves look charming at every age stage. If one is confident, one will always look beautiful, it shows that they accept themselves.” professor Wu said.

Mirror cannot only give confidence to one. By looking in the mirror, one can even find the traces of some diseases from one’s own face.

67.Why does the mirror become the best friend for some people?

A. Because it brings much confidence to them.

B. Because it makes them more beautiful.

C. Because it tells whether they are clean or not.

D. Because it helps them find their own faults.

68.The fact that some people are afraid of looking in the mirror reflects that______.

A. they suffer from metal disease  B. they treat life in a negative way      

C. they are too ugly              D. they can’t bear the pressure of being old

69. The text tells us that______.

A. if you are willing to look in the mirror you are getting old

B. everyone can become attractive at any age

C. confidence can make a person look beautiful

D. old people will accept the reality when they are old

70. The writer wrote this passage to______.

A. advise people to look in the mirror constantly

B. reflect different attitude towards looking into a mirror

C. introduce a way of finding signs of disease from one’s face

D. analyze why people like and dislike to look in the mirror

题型:选择题

根据JB4708—92《钢制压力容器焊接工艺评定》的规定,管板角焊缝试样两焊脚尺寸之差应不大于()。

A.imm

B.2mm

C.3mm

D.4mm

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