3.3The following materials are widely used in high power machines except for .
A: Unalloyed iron
B: Nd2Fe14B permanent magnetic materials
C: Aluminum-iron alloys
D: Silicon-iron
A: Unalloyed iron
B: Nd2Fe14B permanent magnetic materials
C: Aluminum-iron alloys
D: Silicon-iron
举一反三
- Cast iron is the most widely used engineering material, and also the most recycled of all materials
- Which of the following metals is environmental friendly? A: iron B: aluminum C: copper D: titanium
- Which of the following expressions is correct? A: Carbonaceous materials are the most widely used cathodes because they are non-toxic and provide good stability. B: Carbonaceous materials are the most widely used cathodes because they are non-toxicity and good stability. C: Carbonaceous materials are the most widely used cathodes due to their non-toxicity and high stability. D: Carbonaceous materials are the most widely used cathodes due to non-toxic and highly stable.
- An advantage of aluminum pistons， when compared to cast iron pistons is （）.
- Metal utensils such as iron, copper, or aluminum are appropriate to prepare decoctions.