其共轭酸的分子内氢键稳定的是() A.小檗碱 B.麻黄碱 C.伪麻黄碱 D.东莨菪碱

题型:单项选择题

问题:

其共轭酸的分子内氢键稳定的是()

A.小檗碱

B.麻黄碱

C.伪麻黄碱

D.东莨菪碱

E.山莨菪碱

考点:中药执业药师中药化学生物碱的提取与分离、含生物碱的中药实例
题型:单项选择题
一双曲线与椭圆
x2
27
+
y2
36
=1
有共同焦点,并且与其中一个交点的纵坐标为4,则这个双曲线的方程为______.
题型:单项选择题

人手能够完成()种复杂动作,是目前任何一台机器手所不能比拟的。

A.26

B.27

C.28

D.25

题型:单项选择题

某家具厂厂房是一座4层楼的钢筋混凝土建筑物。第一层楼的一端是车间,另一端为原材料库房,库房内存放了木材、海绵和油漆等物品。车间与原材料库房用铁栅栏和木板隔离。搭在铁栅栏上的电线没有采用绝缘管穿管绝缘,原材料库房电闸的保险丝用2根铁丝替代。第二层楼是包装、检验车间及办公室。第三层楼为成品库。第四层楼为职工宿舍。由于原材料库房电线短路产生火花引燃库房内的易燃物,发生了火灾爆炸事故,导致17人死亡,20人受伤,直接经济损失80多万元。
根据上述场景,回答下列问题:

事故调查的基本程序是什么

题型:单项选择题

Questions 1~5


I heard my train approaching. I ran up a two-story escalator and hopped on my train. I was relieved to make it onto my train, but my relief was short-lived-While catching my breath, I heard the announcement that the train would be stopped because of an accident. This was the same announcement I had heard just a week before. The number of train accidents is increasing in Japan, and it is thought that one-third of the accidents result from suicide attempts.
Japan’s suicide rate is one of the highest in the world. More than 30,000 Japanese people take their lives every year, even though Japan is one of the richest and the most advanced countries in the world today.
Allow me to describe some factors of the sickly Japanese situation and to list some silver bullets which might cure the illness. To find the causes of today’s Japanese social problems, I looked back at history and realized that the way Japan dealt with the aftermath of World War Ⅱ might have directly affected what Japanese society is today.
No other country except Japan could become a world leader just 20 to 30 years after losing a major war and achieve one of the world’s highest GNPs. It would have been impossible without Japanese diligence. While I am amazed at Japan’s development, I suspect that Japan also lost something important during the postwar boom era. Japan is the only country that has suffered from the damage inflicted by atomic bombs. However, the nuclear attack is just a half-century-old story for most people now. It seems that Japan moved too swiftly to put this pain behind us in order to grab immediate profits in business. While Japanese society has prospered, it has focused only on short-term gain. Therefore, it has neglected the dignity of human life.
Japanese seek material affluence and convenience, but in chasing these things, we have left behind richness of the mind and the heart. As a result of this, people in Japan have no dreams and hope. Our society has become a cold and lonely place, which lacks life and spirit.
How should Japanese society overcome its unhealthy situation When one does not do what one should do, he or she cannot come alive. It seems that Japan is in exactly the same situation. To make our society vigorous, Japan should carry out its duties and responsibilities. For example, it is the duty of Japan to proclaim the importance of world peace. It is the responsibility of Japan to share with the entire world the technology it has developed which might help prevent global warming. To have a true happy life, each of the people in Japan should rethink the value of life and the importance of caring for each other.
These things have been neglected because Japanese have been overzealous in their quest for money and material wealth. Only when Japanese people understand what true happiness is will Japanese society grasp the importance of human life.

"Silver bullets" (para. 3) could be best replaced by ______

A. effective remedies
B. powerful weapons
C. preventive medicines
D. severe punishments

题型:单项选择题

气候和()是直接影响烟草生产和发育的基本因素。

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