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【判断题】
硬质合金刀具是机械加工中应用最为广泛的刀具之一,因耐热性非常好、所以不能选择使用切削液,这样会使刀具磨损加快。( )A.
正确
B.
错误
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举一反三
【多选题】执行下列代码后,哪个结论是正确的 ( )String[] s=new String[10];
A.
s[10] 为 '';
C.
s[9] 为 null; C. C. s[0] 为 未定义
D.
s.length 为10
【单选题】商场举行摸奖促销活动，对于“抽到一等奖的概率为O.1”．下列说法正确的是（ ）
A.
抽10次奖必有一次抽到一等奖
B.
抽一次不可能抽到一等奖
C.
抽10次也可能没有抽到一等奖
D.
抽了9次如果没有抽到一等奖，那么再抽一次肯定抽到一等奖
【单选题】执行下列代码后,正确的是() String[] s=new String[5]
A.
s[0]=" "
B.
s[0]为null
C.
s[0]未定义
D.
s.length()为0
【单选题】—What did Sally say to Jack? —She asked Jack .
A.
what could she do to help him.
B.
how she has improved English a lot
C.
if he’d like to go shopping with her
D.
why would they go to the museum.
【简答题】When they are going to get off the train, what did Jack Potter do? What does this gesture indicate?
【单选题】6 若有以下 程序 代码: class Person{ String name,department; int age; public Person(String n){name=n;} public Person(String n, int a){name=n; age=a;} public Person(String n, String d, int a ){ // 执行此代码 } 下面那个选...
A.
Person(n,a)
B.
this(Person(n,a))
C.
this(n, a)
D.
this(name.age)
【单选题】现有270g质量百分数为10%的CuC1 2 溶液．下列说法正确的是（ ）
A.
c（Cu 2+ ）=0.2mo1/L
B.
n（CuC1 2 ）=0.2mo1
C.
N（C1 - ）=0.2N A
D.
n（CuC1 2 ）：n（H 2 O）=1：10
【多选题】执行下列代码后,哪个结论是正确的String[]s=newString[10];()
A.
[10]为'';
B.
[9]为null;
C.
[0]为未定义
D.
lengtH为10
【单选题】What did Jack B do after he won the lottery?
A.
He quit his job and led a leisurely life at home.
B.
He began to spend his time exercising, gardening, and traveling.
C.
He stayed on his job, but took his family on an interesting vacation every year.
D.
None of the above.
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