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【单选题】
Consider the following two C# code segments: Which of the following statements is true?A.
The output from these segments is not the same.
B.
The scope of the control variable i is different for the two segments.
C.
Both (a) and (b) are true.
D.
Neither (a) nor (b) is true.
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举一反三
【单选题】有下列几种有机物. （1）CH 3 COOCH 3 （2）CH 2 =CHCH 2 Cl （3）CH 2 ='CH—CHO' 其中既能发生水解反应，又能发生加聚反应的是
A.
(1)与(4)
B.
(2)与(3)
C.
(2)与(4)
D.
(1)、(3)和(4)
【简答题】三相负载有 和 两种连接方式。主要是根据负载的__ _ ___电压来确定采用的连接方式。
【单选题】What does the man mean?
A.
Mr. Li is having lunch now.
B.
He himself (他自己) is having lunch now.
C.
He has just had his breakfast.
【单选题】卤素互化物与卤素单质性质相似。已知CH 2 =CH-CH=CH 2 (1,3-丁二烯)与氯气发生1:1加成的产物有两种: 1CH 2 Cl-CHCl-CH=CH 2 (1,2-加成) 2CH 2 Cl-CH=CH-CH 2 Cl (1,4-加成) 据此推测CH 2 =C(CH 3 )-CH=CH 2 (异戊二烯)与卤素互化物BrCl的1:1加成产物有几种(不考虑顺反异构和镜像异构( )
A.
6种
B.
10种
C.
12种
D.
14种
【单选题】— How did you go to the park? — _______.
A.
By bike.
B.
I live nearby.
C.
At 4 p.m.
D.
I went there with my parents.
【简答题】有下列几种物质：A．金刚石和石墨；B．C 2 H 6 和C 5 H 12 ；C．C 2 H 4 和C 2 H 6 D．CH 3 CH 2 CH 2 CH 3 和CH 3 CH（CH 3 ） 2 ；E． 35 Cl和 37 Cl． （1）属于同分异构体的是______（填序号，下同）；（2）属于同素异形体的是______；（3）属于同系物的是______；（4）属于同位素的是______．
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