把钢件加热到临界温度(在钢的固态范围内,引起钢内部组织结构发生变化的温度)以上,经适当保温,然后随炉缓慢冷却的一种工艺称为( )。 A. 4
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【单选题】听力原文:M: So, what is your biology project about? W: It is about microorganisms that…en, microorganisms that live by Chemosynthesis. M: Ehm…what’s Chemosynthesis? W: Well, it’s pretty complicated. You k...
A.
How hydrothermal vents are formed.
B.
How living things get energy from sunlight
C.
The harmful effects of certain chemicals in the ocean.
D.
Microorganisms that get energy from chemical reactions.