複選題
複選題
40. 在哈柏法製氨的反應：N_2(g) + 3H_2(g)⇄2NH_3(g) + 熱。若此反應已達平衡，則再施加下列何項措施可使 NH₃平衡濃度增大？
(A)加催化劑
(B)定壓下加 He
(C)定容加 He
(D)加壓
(E)降溫 。

151 Which statement is true? (A) Compilation fails. (B) Nothing is added to the file system. (C) Only a new file is created on the file system. (D) Only a new directory is created on the file system. (E) Both a new file and a new directory are created on the file system.

複選題152 Which three statements concerning the use of the java.io.Serializable interface are true? (Choose three.) (A) Objects from classes that use aggregation cannot be serialized. (B) An object serialized on one JVM can be successfully deserialized on a different JVM. (C) The values in fields with the volatile modifier will NOT survive serialization and deserialization. (D) The values in fields with the transient modifier will NOT survive serialization and deserialization. (E) It is legal to serialize an object of a type that has a supertype that does NOT implement java.io.Serializable.

複選題154 Given that c is a reference to a valid java.io.Console object, which two code fragments read a line of text from the console? (Choose two.) (A) String s = c.readLine(); (B) char[] c = c.readLine(); (C) String s = c.readConsole(); (D) char[] c = c.readConsole(); (E) String s = c.readLine("%s", "name "); (AB) char[] c = c.readLine("%s", "name ");

157 If the user types fido when prompted for a password, and then responds bob when prompted for a name, what is the result? (A) pw: got fido name: bob got bob (B) pw: fido got fido name: bob got bob (C) pw: got fido name: bob got bob (D) pw: fido got lido name: bob got bob (E) Compilation fails. (AB) An exception is thrown at runtime.

158  What updates d's value with the date represented by ds? (A) 18. d = df.parse(ds); (B) 18. d = df.getDate(ds); (C) (D) 

159 Which code, inserted at line 14, sets the value of b to 314.159,26? (A) b = nf.parse(input); (B) b = nf.format(input); (C) b = nf.equals(input); (D) b = nf.parseObject(input);

160 Which code fragment, inserted at line 24, outputs "123abc 123abc"? (A) sb1.append("abc"); s1.append("abc"); (B) sb1.append("abc"); s1.concat("abc"); (C) sb1.concat("abc"); s1.append("abc"); (D) sb1.concat("abc"); s1.concat("abc"); (E) sb1.append("abc"); s1 = s1.concat("abc"); (AB) sb1.concat("abc"); s1 = s1.concat("abc"); (AC) sb1.append("abc"); s1 = s1 + s1.concat("abc"); (AD) sb1.concat("abc"); s1 = s1 + s1.concat("abc");

161 What is the result? (A) The value "4" is printed at the command line. (B) Compilation fails because of an error in line 5. (C) Compilation fails because of an error in line 9. (D) A NullPointerException occurs at runtime. (E) A NumberFormatException occurs at runtime. (AB) An IllegalStateException occurs at runtime.

162 What is the result? (A) three (B) other (C) An exception is thrown at runtime. (D) Compilation fails because of an error on line 12. (E) Compilation fails because of an error on line 13. (AB) Compilation fails because of an error on line 15.

複選題163 Which two code fragments, inserted independently at line 3, generate the output 4247? (choose two.) (A) (B) (C) (D) (E) 

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