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【简答题】
某天然油脂的化学式为C 57 H 106 O 6 。1mol该油脂水解可得到1mol甘油、1mol不饱和脂肪酸B和2mol直链饱和脂肪酸C。经测定B的相对分子质量为280，原子个数比为C:H:O=9:16:1。 (1)写出B的分子式：____________。 (2)写出C的结构：_____________ ；C的名称是___________。 (3)写出含5个碳原子的C同系物的同分异构体的结构：________ ；________。
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【单选题】Citizens appear to have responded to the call by politicians to become better qualified.
A.
Y
B.
N
C.
NG
【单选题】To become a qualified librarian, you must take a ______ course at a special library school.
A.
two years'
B.
two-year
C.
two years
D.
two year's
【单选题】The days ________ I spent in the countryside in my childhood were the happiest time _________ I had ever had in my life.
A.
when; when
B.
where; that
C.
that; which
D.
that; that
【简答题】Sentence Structure ysis A good teacher should teach his students how to become qualified citizens. 2. It does not matter what age the child is. 3. Some people forgot to sweep the floor. 4.Great ch...
【简答题】My father died in December. He had spent the last several years in hospital, and my mother spent a lot of her time him. That is without doubt, a situation for any family. And the was a team of fairly ...
【简答题】The days I spent in the countryside in my childhood were the happiest time I had ever had in my lifeA. when ; when B. where;that C. that ; which D. that ;that
【多选题】许多的计算机网络行为无法可依、无章可循，导致网络上计算机犯罪处于无序状态，面对日趋严重的网络犯罪，必须建立与网络安全相关的法律、法规。信息安全的实现目标包括( )。
A.
对信息的来源进行判断，对伪造来源的信息予以鉴别
B.
保证机密信息不被窃听，或窃听者不能了解信息的真实含义
C.
保证数据的一致性，防止数据被非法用户篡改
D.
保证合法用户对信息和资源的使用不会被不正当地拒绝
【单选题】Gaining the knowledge ________ environmental protection will help you to become a qualified environmentalist.
A.
addicted to
B.
concerned about
C.
related to
D.
appealed to
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