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【判断题】
数组是一种复杂的数据结构,数组元素之间的关系即不是线性的,也不是的。A.
正确
B.
错误
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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】在中国外文局成立70周年之际,习主席向()致诚挚问候。
A.
中外文局全体干部职工
B.
支持中国国际传播事业的外国专家
C.
支持中国国际传播事业的外国友人
D.
以上全对
【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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