裂缝（crack；fissure）
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1、在Santorini fissure中走行的结构有（）。
在Santorini fissure中走行的结构有（）。A腮腺鞘上部发出之索状纤维束B腮腺内的小动、静脉C耳颞神经D外耳道前下部的淋巴管E外耳道上部的淋巴管
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2、Small crack in the crankshaft bearing
Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）Acorrosion frettingBinsufficient lubricationCabnormal wearDfatigue failure
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3、The lengthening of a crack formed in t
The lengthening of a crack formed in the shell plating of a ship may be prevented by （）.Awelding brackets across both ends of the crackBchi...
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crack表示中文（）。A粗糙B裂纹C缺陷
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5、Cracks may be prevented from developin
Cracks may be prevented from developing at the corners of welded plating inserts by（）.Asquaring the cornersBrounding the cornersCplug welding the cornersDslot welding the corner
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6、土坝裂缝按成因分：沉陷裂缝、滑坡裂缝、干缩裂缝、（）、振动裂缝。
土坝裂缝按成因分：沉陷裂缝、滑坡裂缝、干缩裂缝、（）、振动裂缝。