题目内容

Substitution refers to the replacement of one item by another in the text and is concerned with the way substitutions realise the grammatical cohesion in the text.()

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The same conjunction may indicate different cohesive relation in different contexts.()

Oral cavity is the place where oral, nasal and nasalised oral sounds are shaped.()

千帕的符号是()。

A. KP
B. KC
C. Kj
D. CP

要求钨极具有()、施焊损耗小、引弧和稳弧性好等特性：

A. 电流容量小
B. 电流容量大
C. 电极压降小
D. 电极压降大