题目内容

Which of the fuel injection systems listed uses a spring loaded differential spray needle

A. Common-rail injection
B. Air injection
C. Jerk pump injection
Distribution injection

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颗粒污染物又称总悬浮颗粒物，是指能悬浮在空气中，空气动为学当量直径小于或等于()μm的颗粒物。

A. 100
B. 200
C. 500
D. 800

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有关衣原体性状的论述错误的是

A. 严格的细胞内寄生
B. 生活周期中包括原体和始体两个阶段
C. 形成细胞内包涵体
D. 以复制方式繁殖
E. 对抗生素敏感

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When using a mechanical(windup type)marine chronometer，how often should it be reset ().

A. Only when it is overhauled
B. Whenever the chronometer error exceeds approximately four minutes
C. At the start of each voyage
D. At the start of each voyage
E. If the chronometer rate changes from gaining to losing or vice versa

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当测定硬度时，存在Al3+干扰，选择()消除干扰。

A. 控制溶液的PH值
B. 络合掩蔽法
C. 氧化还原掩蔽法
D. 沉淀掩蔽法

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Which of the fuel injection systems listed uses a spring loaded differential spray needle

A. Common-rail injection B. Air injection C. Jerk pump injection Distribution injection

颗粒污染物又称总悬浮颗粒物，是指能悬浮在空气中，空气动为学当量直径小于或等于()μm的颗粒物。

有关衣原体性状的论述错误的是

When using a mechanical(windup type)marine chronometer，how often should it be reset ().

当测定硬度时，存在Al3+干扰，选择()消除干扰。

A. Common-rail injection
B. Air injection
C. Jerk pump injection
Distribution injection