Examkin

Soru

Zorluk: OrtaExplicit Main Idea

Passage:
Periodic chemical passivation is essential for maintaining the corrosion resistance of stainless steel hydraulic tubing on naval surface vessels. During machining and fabrication, microscopic particles of free iron become embedded in the outer surface of the tubing, disrupting the natural chromium oxide protective layer. Submerging the cleaned lines in a nitric or citric acid bath dissolves these residual surface contaminants without degrading the underlying alloy. This chemical treatment restores an unbroken passive oxide film, effectively preventing premature pitting and system failure under harsh maritime conditions.

Statement: The primary point explicitly stated in the passage is that periodic chemical passivation is required to maintain the corrosion resistance of stainless steel hydraulic tubing on naval vessels.

Cevap: Cevap

Cevap

True
The statement is correct because the lead sentence explicitly states the central idea: chemical passivation is vital for preserving corrosion resistance in stainless steel hydraulic tubing on naval surface vessels. All subsequent sentences serve as supporting evidence detailing contamination causes and the protective restoration process.

Adım Adım Çözüm

1
Read the passage to locate the lead topic sentence.
Identified the opening sentence: 'Periodic chemical passivation is essential for maintaining the corrosion resistance of stainless steel hydraulic tubing on naval surface vessels.'
Explicit main ideas are directly stated within the text, most frequently in the first or concluding sentence.
2
Analyze the remaining sentences to verify if they serve as supporting details.
The subsequent sentences elaborate on why iron contamination occurs and how acid baths restore the protective oxide film to prevent pitting.
Supporting details substantiate, clarify, or explain the central thesis rather than establishing a new topic.
3
Evaluate the provided statement against the identified explicit main idea.
The statement directly paraphrases the explicit topic sentence of the passage.
Confirming alignment between the evaluation statement and the passage's primary topic sentence establishes that the statement is true.

Anahtar Kavram

Identifying an explicitly stated topic sentence that expresses the central point of an expository paragraph.
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Konular

Explicit Main Idea

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