数据库管理系统DBMS主要由()两大部分组成。
A、文件管理器和查询处理器
B、事务处理器和存储管理器
C、存储管理器和查询处理器
D、文件管理器和存储管理器
参考答案:C
某电阻两端的电压是3V时,通过它的电流是0.6A,则它的电阻是______Ω,现在使它两端的电压变为0时,则此时它的电阻为______Ω.
句型转换,每空一词。
1.The man has to see a doctor. (改为否定句)
The man ______ _____ to see a doctor.
2.They are staying there for three weeks.(对划线部分提问)
_____ _____ are they staying there?
3. Tom is 10 years old. Bob is 12 years old. (合并为一句)
Tom is two years _____ _____ Bob.
4. Shanghai is the biggest city in China.(改为同义句)
Shanghai is bigger than _____ _____ _____ in China.
5. Mary needs to take a bus to school.(改为一般疑问句)
_____ Mary_____ to take a bus to school?