正确答案: A

疲劳强度高

题目：高温下加载频率大时，对材料的疲劳强度影响是( )。

解析：A

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[单选题]A机动船从B机动船右正横后22．5度方向上接近B船，并致有构成碰撞危险，下列说法何者正确？I、如A船对本船是否在追越前船有任何怀疑，应假定在追越；II、如B船对A船是否在追越本船有任何怀疑，应假定在追越；III、如B船对A船是否正在追越本船有怀疑，应将本船作为让路船

I、III

[单选题]Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.

The direction of pressure on the journal in four-stroke engine is continuously