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【单选题】
在 PHP中可以使用()函数来截取出字符串中指定长度的子串。A.
strlen()
B.
str _replace ()
C.
substr()
D.
ucwords ()
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反馈参考答案：
举一反三
【简答题】数据库基本结构不包括（ ）。
【判断题】课堂导入的时间不宜过长,否则会冲击新课的讲述。一般在5~8分钟内迅速缩短学生与教师之间的距离,以及学生与教材之间的距离,把学生的注意力集中到课程内容上来,完成向新课教学的过渡。
A.
正确
B.
错误
【单选题】The______has several major components, including the system kernel, a memory management system, the file system manager, device drivers, and the system libraries.
A.
application
B.
information system
C.
network
D.
operating system
【单选题】There are two main methods of organizing governments—the unitary system and the federal system. The unitary state places most power in the hands of central government officials, whereas the federal st...
A.
scratched
B.
reinforced
C.
reduced
D.
abandoned
【单选题】The operating system has several major components，including the(64)，a memory management system，the file system manager，device drivers，and the system libraries．
A.
application kernel
B.
information kernel
C.
network kernel
D.
system kernel
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