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【简答题】
根据句意、首字母提示,完成句中所缺的单词。 1.E_________ is ready,let's begin our class. 2.She said she was m_________ at Cathy. 3.Don't be n_________,I am sure you can pass the exam if you work hard. 4.You should r_________ the book to the library after you finish reading. 5.You ran so fast that I couldn't f_________ you.Please wait for me. 6.The children were playing' football on the p_________ when I got to school. 7.It's wrong to c_________ others' homework.You should do it by yourself. 8.I like living in a small v_________ because it's very quiet and the air is very fresh.
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【简答题】简述String类和StringBuffer类的区别?
【单选题】Fires occurring in combustible metals, such as sodium or magnesium, are classified as a _____.
A.
class A
B.
class B
C.
class C
D.
class D
【多选题】《异步电动机连锁正反转控制》 与《异步电动机两地控制》相比:
A.
增加了热过载继电器的数量
B.
增加了交流接触器的数量
C.
增加了按键开关的数量
D.
增加了保险管的数量
E.
减少了按键开关的数量
【多选题】下列关于String类和stringBuffer类说法正确的有（）。
A.
String类是不可变类，一个String对象所包含的字符串内容永远不会被改变
B.
如果对字符串中的内容经常进行操作，特别是内容要修改时，应使用StringBuffer
C.
StringBuffer类是可变类，一个StringBuffer对象所包含的字符串内容可以被添加或修改
D.
字符串缓冲区支持可变的字符串