有机物(如图)是甲烷被苯基取代的产物,下列说法不正确的是 A.分子式为C25H

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问题:

有机物(如图)是甲烷被苯基取代的产物,下列说法不正确的是

A.分子式为C25H20

B.所有碳原子在一个平面上

C.此物质属于芳香烃

D.此物质不属于苯的同系物

考点:结构简式结构式
题型:选择题

根据首字母,中文或括号里词的适当形式填写单词。只限填Module 6 Unit 2-Unit 5的单词。(共10小题;每小题1分,满分10分)

小题1:This book was a_______ (合适地) written in a style accepted by teenagers, who enjoy reading it.

小题2:I keep getting c_______ (矛盾的) advice — some people tell me to keep it warm and some tell me to put ice on it. 

小题3:To make matters worse, some adolescents are so a_______ to computer games that too much time and energy are wasted.

小题4:The little boy was _______ (embarrass) when his mother, who had a severe scar on her face, attended his first teacher-parent conference.

小题5:Both children have _______ (normal) high levels of infectious virus in their blood.

小题6:To g_______ (确保, 保证) the policy could be effective, the local government took measures to carry out lots of detailed related plans to support the policy.

小题7:E-mail _______ (transform) the way people communicate in the past few years, which makes people feel it convenient to keep in touch with each other.

小题8:You see, during adolescence I also smoked a lot, but after I know smoking damages health, I stopped smoking by _______ (strong) my resolve.

小题9:Some people are in favor of the policy. They think it is reasonable and fair to carry out the policy, because the more the oil _______ (consume) is, the more money the drivers pay, which can avoid the unnecessary driving.

小题10:Joyfully, the elderly _______ (present) with flowers, fruits and presents on that day.

题型:选择题

已知sin(α+β)=1,求证:tan(2α+β)+tanβ=0

题型:选择题

28岁已婚女性,停经14周, * * 少量暗红色出血10天,妇查宫底耻上未及,多普勒经腹未测到胎心,为明确诊断最主要的辅助检查是()

A.B超检查

B.尿妊娠试验

C. * * 镜检查

D.血HCG测定

E.羊膜镜检查

题型:选择题

组织的激励行为

题型:选择题

具有藏泄互用关系的两脏是()

A.心与肺

B.肺与肾

C.肾与肝

D.肝与脾

E.脾与心

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