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【判断题】
判断题 1、 只要零件不经挑选或修配,便能装配到机器上,该零件就具有互换性( ) 2、 完全互换的零部件装配的精度必高于不完全互换。( ) 3、 厂外协作件要求采用不完全互换生产。( ) 4、 具有互换性的零件,其几何参数必须制成绝对精确。( ) 5、 企业标准比国家标准层次低,在标准要求上可稍低于国家标准。( ) 6、 国家标准中的强性标准是必须执行的,而推荐性标准执行与否无所谓( ) 7、 在确定产品的参数或参数系列时,应最大限度地采用优先数和优先数系 ( ) 8、 优先数系是由一些十进制等差数列构成的。( )A.
正确
B.
错误
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举一反三
【单选题】设集合U={1，2，3，4，5}，集合M={3，5}，N={1，4，5}，则M∩ =' ' （ ）
A.
{5}
B.
{3}
C.
{2，3，5}
D.
{1，3，4，5}
【单选题】When was the hammock invented and by whom?
A.
The Indians had invented the hammock long before they came to South America.
B.
The Indians had invented the hammock long before the Europeans came to South America.
C.
The Europeans invented the hammock after they made acquaintance with the Indians.
D.
The Europeans had invented the hammock before they went to South America.
【单选题】设全集U={1，2，3，4，5}，集合M={1，3，5}，集合N={3，4，5}，则集合（C U M）∩N等于（ ）
A.
{4}
B.
{2，3，4，5}
C.
{1，3，4，5}
D.
?
【单选题】It’s not the whole nation rose up and drove the enemy out of their homeland.
A.
before long
B.
long before
C.
soon
D.
a long time
【单选题】Not ____ he died, he received an award for his selfless service to the old. [ ]
A.
long before
B.
before long
C.
long ago
D.
shortly before
【单选题】He said he had been to Hong Kong ____ and he would go there _____ once again. [ ]
A.
long before, before long
B.
before long, long before
C.
long ago, before long
D.
long before, long before
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