【名词&注释】
疲劳强度(fatigue strength)、机动船(motor vessel)、不一定(not always)
[单选题]高温下加载频率大时，对材料的疲劳强度影响是( )。
A. 疲劳强度高
B. 疲劳强度低
C. 不变
D. 不一定
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举一反三：
[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
A. I
B. I、II
C. I、III
D. I、II、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________.
A. The direction of pressure on the journal in four-stroke engine is continuously
B. positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C. four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D. Low-stroke engines usually consume less lube oil than four-stroke engines
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