空间接线器的组成是
A. 电子交叉矩阵和话音存储器
B. 控制存储器
C. 电子交叉矩阵和控制存储器
D. 话音存储器和控制存储器
若某个S接线器的入线数为16，且每条入线PCM每帧为128个时隙，则每个控制存储器的存储单元数量及每个存储单元大小至少为：
A. 1024个，8bit
B. 2048个，8bit
C. 128个，4bit
D. 2048个，4bit
According to Brown (1987), EA can be applied to foreign language teaching in four ways. Which one is not right?
A. Correcting errors in the classroom.
B. Providing information.
C. Designing curricula and teaching materials.
D. Organizing remedial teaching.
Corder's Classification of Errors do not include
A. Pre-systematic errors
By systematic errors
C. Grammar systematic errors
D. In the post- systematic errors
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