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【判断题】
烯烃和某些试剂作用时,中的Π键断裂,两个一价的原子团,分别加到两个的碳原子上,形成两个新的σ键,这种反应称为加成反应。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】已知 Sn白 ® Sn灰【图片】=-2.09kJ·mol-1Sn白 + 2Cl2 (g) ＝SnCl4 (l) 【图片】(1)-------(1)Sn灰 + 2Cl2 (g) ＝SnCl4 (l)【图片】(2)-------(2)Sn白 + 2Cl2 (g) ＝SnCl4 (s) 【图片】(3)-------(3)则三个反应在相同温度下【图片】的关系是
A.
(1) ＞ (2) ＞ (3)
B.
(2) ＞ (1) ＞ (3)
C.
(3) ＞ (2) ＞ (1)
D.
(1) ＞ (3) ＞ (2)
【单选题】______ is issued under the provision of International Convention for the Prevention of Pollution from Ships，1973，as modified by the Protocol of 1978 relating thereto.
A.
INTERNATIONAL OIL POLLUTION PREVENTION CERTIFICATE
B.
CARGO SHIP SAFETY CONSTRUCTION CERTIFICATE
C.
CARGO SHIP SAFETY EQUIPMENT CERTIFICATE
D.
CARGO SHIP SAFETY RADIOTELEPHONY CERTIFICATE
【单选题】已知 Sn( 白 ) Sn( 灰 ) = -2.09 kJ·mol -1 Sn( 白 ) + 2Cl 2 (g) = SnCl 4 (l) -(1) Sn( 灰 ) + 2Cl 2 (g) = SnCl 4 (l) -(2) Sn( 白 ) + 2Cl 2 (g) = SnCl 4 (s) -(3) 则三个反应在相同温度下 的关系是
A.
> >
B.
> >
C.
> >
D.
> >
【简答题】exchanged expectation receipt purchase devoted to Customer service is the provision of service to customers before, during and after a ________. Customer service is a series of activities designed...
【简答题】要在幻灯片中插入表格、图片、艺术字、视频、音频等元素时,应在 选项卡中操作。
【单选题】The provision of information within the business entity is referred to as
A.
financial accounting
B.
management accounting
C.
commercial accounting
D.
public accounting
【判断题】1.
The definition of first aid is the provision of emergency treatment and life
support for people suffering injury or illness.
A.
正确
B.
错误
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