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【多选题】
中药配伍的目的是A.
增强疗效
B.
减轻毒性
C.
扩大治疗范围
D.
改变药物的味
E.
适应复杂病情
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举一反三
【单选题】In a sand-casting mould, the‘core’is ( )
A.
a inset made from sand
B.
to form interior surfaces of the casting
C.
both of the above
【多选题】What's the advantages of casting ?
A.
Parts with intricate internal cavities /passage
B.
Parts with smooth ,flowing designs
C.
the economy of using less metal for a part
D.
Casting process is complex
【单选题】Defect of cavities in casting is caused by: ( )
A.
metal shrinkage
B.
poor casting sand quality
C.
high temperature
D.
all of the bove
【单选题】Defect of cavities in casting is caused by: ( )
A.
high temperature
B.
metal shrinkage
C.
poor casting sand quality
D.
all of the bove
【多选题】What's the disadvantages of casting ?
A.
shrinkage cavity, Porosity
B.
coarse grain
C.
position deviation,shape incompletion
D.
The surface of the casting is rough, adhering to a layer that is difficult to remove the sand.
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