3. 煞車總泵內防止門(Check Valve)的功用為保持油管內有相當殘壓，防止空氣滲入。
(A)O
(B)X

49. What was a key factor contributing to the increase in ADHD diagnoses and medication use before the pandemic? (A) Increased stress levels in modern society (B) Greater public awareness of ADHD symptoms through social media (C) Changes in diagnostic criteria that broadened the definition of ADHD (D) A rise in online learning, which made ADHD symptoms more noticeable (E) Advances in brain imaging technology that improved diagnostic accuracy

50. How did the pandemic exacerbate ADHD symptoms in some individuals? (A) Increased screen time during the pandemic directly caused a rise in ADHD cases. (B) Remote work and school closures created an environment with more distractions. (C) Many people developed ADHD due to increased stress and isolation during the pandemic. (D) During the pandemic, doctors introduced new diagnostic criteria that made ADHD easier to identify. (E) The lack of structured routines during the pandemic made it more difficult to manage ADHD symptoms.

1. 缸數愈多，動力重疊度數愈大，飛輪所需儲存動力愈大。(A)O(B)X

2. 凸輪軸主要功能為開啟汽門，汽門彈簧為關閉汽門。(A)O(B)X

4. 含氧感知器(O2 Sensor)是用以感測吸入空氣之含氧量。(A)O(B)X

5. 柴油引擎當噴射壓力過低時，霧化不良，引擎易排黑煙，並產生爆震現象。(A)O(B)X

6. PCV 系統是將曲軸箱中之吹漏氣導引至汽缸中燃燒。(A)O(B)X

7. 汽油引擎的最大馬力及扭力均在引擎轉速最高時。(A)O(B)X

8. 活塞肖不在活塞中央位置而稍有偏移，其目的是為使引擎運轉平順。(A)O(B)X

9. 機油具有密封、清潔、緩衝等功用。(A)O(B)X