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An opaque material is ______.

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We declare that no wood packing material was used in this shipment.  No declaration wan made whether wood packing materials had been used or not.  If you don’t make any declaration. we will not use any wood packing material.  We will not use any wood packing material since you have provided us a declaration of no-wood packing material.  
We declare that no wood packing material was used in this shipment  No declaration was made whether wood packing materials had been used or not  If you don’t make any declaration,we will not use any wood packing material  We will not use any wood packing material since you have prodded us a declaration of no-wood pack- ing material  
and  to look  material  on  
varies with the courses of the ship  is equal to the effects of the magnetic material in the ship  is opposite to the effects of the magnetic material in the ship  is to the right or left of the magnetic material"  
We declare that no wood packing material was used in this shipment  No declaration was made whether wood packing materials had been used or not  If you don’ t make any declaration,we will not use any wood packing material  We will not use any wood packing material since you have provided us a declaration of no-wood packing material  
truly  rapidly  periodically  frequently  
depended  depending  to depend  depends  
"Why are there shadows"  "The transparent materials"  "How to cast a shadow"  "Shadows and light waves"  
a short story  a popular science reading  a common knowledge in routine life  an essay  
truly  rapidly  periodically  frequently  
We declare that no wood packing material was used in this shipment  No declaration was made whether wood packing materials had been used or not  If you don' t make any declaration,we will not use any wood packing material  We will not use any wood packing material since you have provided us a declaration of no-wood packing material  
varies with the courses of the ship  is equal to the effects of the magnetic material in the ship  is opposite to the effects of the magnetic material in the ship  is the deflection of its card to the right or left of the magnetic material"  
Aluminium.  Silver.  Milk.  Mineral water.  
truly  rapidly  periodically  frequently  
We declare that no wood packing material was used in this shipment.  No declaration was made whether wood packing materials had been used or not.  If you don't make any declaration, we will not use any wood packing material.  We will not use any wood packing material since you have provided us a declaration of no-wood packing material.  
water contamination  mixing oils of two widely different viscosities  overheating  aeration  
a material that can be seen through  a translucent(半透明的) material  a material that can not be seen through  a lucent material  
the broken ,rock resulting from the impact of a meteorite against the earth  material that exists on planets other than the earth  a composite of rock typical of continental areas of the earth  material that is man-made to simulate materials that existed far back in geological history  
Light waves are beams of light.  Light waves can penetrate any materials except men' s bodies.  Light waves can penetrate transparent materials.  Light waves can penetrate some materials.  
signaling that all personnel are clear before lifting or lowering material  Examining material for sharp edges or protruding points before handling  Closing, tagging, or securing valves that permit entrance of steam, water, or airinto a fitting or other equipment  Throwing materials from high places to the deck  

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