下列关于表面活性剂的正确表述是A.表面活性剂均具有很大毒性B.阴离子表面活性剂可作为

题型:单项选择题

问题:

下列关于表面活性剂的正确表述是

A.表面活性剂均具有很大毒性
B.阴离子表面活性剂可作为杀菌剂与消毒剂
C.阴、阳离子表面活性剂以任意比例混合使用,表面活性均会增加
D.表面活性剂不仅增加抑菌剂溶解度,且可增加其抑菌能力
E.吐温类表面活性剂的溶血作用最小

考点:西药执业药师药学专业知识(二)西药执业药师药学专业知识(二)
题型:单项选择题

在下图装置中,烧瓶中充满干燥气体a,将滴管中的液体b挤入烧瓶内,轻轻振荡烧瓶,然后打开弹簧夹f,烧杯中的液体b呈喷泉状喷出,但未能充满烧瓶。则a和b分别是(    )

 a(干燥气体)b(液体)
 A.NO2
 B.CO24mol·L-1NaOH溶液
 C.Cl2饱和NaCl水溶液
 D.NH31mol·L-1盐酸
 

题型:单项选择题

肺是气体交换的主要场所.______.

题型:单项选择题

阅读理解。

     Le Whif, an inhaler (吸入剂) that allows chocolate lovers to meet their needs whenever they please

without putting on weight, is to be released in British stores. The invention, called the world's first breathable

food by its creators, lets consumers suck in the taste of chocolate or coffee while taking on less than one

calorie. Its makers claim it will enable dieters to enjoy their favorite snacks without worrying about their

waistline.

     The lipstick-style tube contains hundreds of milligrams of tiny food particles which are small enough to

become conveyed by air, but too large to enter the lungs. Each Le Whif contains enough flavor for about

eight to ten whiffs (喷射) and costs 1.99 on its own, or £4.99 for a pack of three. The inhaler is available

in chocolate, raspberry chocolate and mint chocolate models as well as coffee flavor, which gives a dose of

caffeine equivalent to a small short of strong black coffee.

     It was invented by Prof. David Edwards. He said Le Whif was not designed to replace food but could be

used to increase dining experiences, such as allowing people to sample a variety of dishes from restaurant

menus before ordering their meal.

     He said, "In terms of living off whiffing we aren't even close to being there. But there clearly has been a

revolution over the last few years where we are eating smaller amounts of food more frequently and choosing

food or its aesthetic (审美的) pleasure. We will be launching new whiffing experiences probably every six

months. It is reasonable to assume that the next line of whiffing products will be even more health centered."

     The product was released in Paris in 2009 and the initial production run of 25,000 inhalers were sold out

within a month. It has since been made available across France and in the US. In Britain Le Whif is to be sold

firstly in House of Fraser for a month, after which it could become more widely distributed.

1. According to Paragraph 1, Le Whif ____.

A. is a new kind of healthy food

B. contains few nutrients in fact

C. is popular with British chocolate lovers

D. is able to help dieters lose weight

2. What's the main purpose of inventing Le Whif?

A. To produce all kinds of chocolate.

B. To replace the traditional chocolate.

C. To change the coffee flavor.

D. To increase people's dining experiences.

3. Which of the following statements does David Edwards agree with?

A. His new products will come out once a year.

B. Le Whif is a revolution that will change people's life.

C. The whiffing products in the future will be improved.

D. Le Whif can make people eat less food.

4. From the passage, we know that ____.

A. customers can buy Le Whif all over the world

B. I.e Whif hasn't been made available in British stores

C. Ie Whif contains hundreds of tiny food particles which are small enough to enter the lungs

D. Le Whif can help to lose weight but is harmful to health

题型:单项选择题

下面关于PC机性能的叙述中,错误的是

A.CPU的工作频率越高,通常处理速度就越快

B.主存储器的存取周期越长,存取速度越快

C.快存(高速缓存存储器)的速度比主存储器快得多

D.总线传输速率不仅与总线的时钟频率有关,还与总线宽度有关

题型:单项选择题

拨杆喷油泵主要由哪些零件组成?

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