举一反三
- Most compounds bear primary stress on the first element.
- Compounds can be classified into . A: attributive compounds B: coordinative compounds C: subordinative compounds D: derivative compounds
- Compounds composed of molecules (molecular compounds) usually contain only elements.
- S-containing compounds are a group of naturally occurring chemical compounds that mostly contain basic nitrogen atoms.
- Aroma compounds in food have no relationship with other compounds in<br/>food such as non volatile compounds. ( )
内容
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Matter is composed of ______ , compounds and ______ .
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植物化学物可以分为（ ）。 A: Phenolic compounds B: S-containing compounds C: Terpenes D: Alkaloid
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The cross section of a straight beam remains plane when the beam deforms due to bending. This causes ( ) on one side of the beam and ( ) on the other side. The neutral axis is subjected to ( ) .? normal stress; shear stress; zero stress|tensile stress; compressive stress; zero stress|compressive stress; tensile stress; maximum normal stress|shear stress; normal stress; zero stress
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Compounds with a symmetry plane are chiral
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Which is NOT true about sentence stress or any stress? A: Stress is about contrast. B: Stress is relative. C: Sentence stress is flexible. D: Sentence stress is fixed.