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【单选题】
克莱门森(Clemmensen)还原反应,所用催化剂是( )A.
NaBH4
B.
LiAlH4
C.
Zn-Hg
D.
AlCl3
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【单选题】What is the lecture mainly about?
A.
The role of ethylene in plant aging processes
B.
The discovery of ethylene by fruit growers
C.
Differences between ethylene and other hormones
D.
How plant hormones influence growth
【多选题】某商场项目,建设单位因急于开业,在尚未组织竣工验收的情况下提前将部分楼层交由商户进行店铺装修。装修过程中,建设单位陆续发现了一些质量缺陷,遂以质量不符合约定为由将施工单位诉到人民法院,则下列质量问题中,不能够获得人民法院支持的有( )。
A.
．卫生间瓷砖贴面脱落、水管漏水
B.
电梯运行声响过大
C.
屋面彩钢板破损
D.
地基沉降不均匀
E.
部分承重墙出现裂缝
【简答题】VHDL语言的客体,或称为数据对象,常见的包括____、____和____。
【简答题】A build up of ethylene gas may result in an explosion. ______
【简答题】Ethylene gas is put out by means of___________.
【单选题】In the NMR spectrum, the chemical shifts of ethylene, acetylene and benzene are in the order of ( ).
A.
benzene > ethylene > acetylene
B.
acetylene >ethylene > benzene
C.
ethylene > benzene > acetylene
D.
the chemical shifts are the same
【多选题】How does the ethylene signaling pathway work in plant cells?
A.
In the absence of ethylene, the receptor directly activates an associated protein kinase, which then indirectly promotes the destruction of the transcription regulator that switches on ethyleneresponsive genes. As a result, the genes remain turned off.
B.
In the presence of ethylene, the receptor and kinase are both inactive, and the transcription regulator remains intact and stimulates the transcription of the ethylene-responsive genes.
C.
The kinase that ethylene receptors interact with is a serine/threonine kinase that is closely related to the MAP kinase kinase kinase found in animal cells.
D.
The ethylene receptor is located in the endoplasmic reticulum; because ethylene is hydrophobic, it passes easily into the cell interior to reach its receptor.
【简答题】VHDL 语言客体包括( )( )和( )。
【单选题】Monomers with one or more multiple covalent bonds, such as ethylene
A.
Unsaturated hydrocarbons
B.
Aerogels
C.
Saturated hydrocarbons
D.
Zeolites
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