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【单选题】
下列关于缩松的说法错误的是______。A.
常出现于结晶温度范围较宽的合金中。
B.
常分布在铸件壁的轴线区域、缩附近或铸件厚壁的中心部位。
C.
缩松和缩形成的基本原因和条件是相同的。
D.
金属的凝固区域越宽，产生缩松的倾向越大。
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举一反三
【单选题】Mineral deficiencies can often be detected by specific symptoms such as chlorosis(loss of chlorophyll resulting in yellow or white leaf tissue), necrosis(isolated dead patches), anthocyanin formation(...
A.
fight off
B.
show
C.
cause
D.
spread
【简答题】vi. think that sb. or their behavior, ideas, etc. are bad or wrong 不赞同;反对
【简答题】There’s a big difference between the amount required to pr deficiencies that would lead to serious degeneration, and the amount of each vitamin and mineral you need for optimum health
【简答题】mineral nutrition
【简答题】vt. officially accept a plan, proposal, etc. 批准;认可vi. think that sb. or sth. is good, right, or suitable 赞许;赞成;同意
【单选题】Which is not the cause of mineral form?
A.
chemical composition
B.
crystal structure
C.
crystallization environment
D.
colour of mineral
【单选题】Severe vitamin and mineral deficiencies can lead to mental ___________.
A.
chaos
B.
disorders
C.
confusion
D.
mix
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