___________(必须指出) China is a developing country and will always take sides with the Th
___________(必须指出) China is a developing country and will always take sides with the Third World.
___________(必须指出) China is a developing country and will always take sides with the Third World.
指出哪些化合物可在近紫外区产生吸收带。
(2)СНзСН2ОСН(СНЗ)2
(3)CH3CH2CCH
(5)CH2=C=0
(6)CH2=CH-CH=CH-CH3
指出下列分子的点群、旋光性和偶极矩情况:
(1)H3C—O—CH3;
(2)H3C—CH=CH2;
(3)IF5;
(4)(环形);
(5)CIH2C—CH2Ci(交叉式);
指出下列程序运行的结果 public class Example { String str = new String("good"); char[] ch = { ’a’, ’b’, ’c’ }; public static void main(String args[]) { Example ex = new Example(); ex.change(ex.str, ex.ch); System.out.print(ex.str + " and "); System.out.print(ex.ch); } public void change(String str, char ch[]) { str = "test ok"; ch[0] = ’g’; } }
A、good and abc
B、good and gbc
C、test ok and abc
D、test ok and gbc
指出下列各化合物所含官能团的名称。
(1)CH3CH=CHCH3
(2)CH3CH2Cl
(3)
(4)
(5)
(6)CH3CH2COOH
(7)
(8)
指出下列程序运行的结果 () 。public class Example{ String str=new String("good"); char[]ch={'a','b','c'}; public static void main(String args[]){ Example ex=new Example(); ex.change(ex.otr,ex.ch); System.out.print(ex.str+"and"); System.out.print(ex.ch); } public void change(String str,char ch[])} str="test ok"; ch[0]≈'g'; } }
A.good and abc
B.good and gbc
C.test ok and abc
D.test ok and gbc
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