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【多选题】
下列关于双代号网络计划绘图规则的说法，正确的有( )。A.
网络图必须正确表达各工作间的逻辑关系
B.
网络图中可以出现循环回路
C.
网络图中一个节点只有一条箭线引入和一条箭线引出
D.
网络图中严禁出现没有箭头节点或没有箭尾节点的箭线
E.
单目标网络计划只有一个起点节点和一个终点节点
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举一反三
【单选题】The Mona Lisa, ______ in Italy, is now in the Louvre, a museum in Paris.
A.
who painted
B.
who has painted
C.
which painted
D.
which was painted
【单选题】Right now there is a sale of 19th-century European paintings and sculpture in the museum.
A.
photographs
B.
images
C.
statues
D.
stone paintings
【单选题】The version _______ to be closest to the author’s original now belongs to a national museum in Paris.
A.
was thought
B.
thought
C.
is thought
D.
thinking
【单选题】The version _____ to be closest to the author’s original now belongs to a national museum in Paris.
A.
is thought
B.
thinking
C.
being thought
D.
thought
【单选题】The house _____ Mozart composed “The Magic Flute” is a museum now.
A.
which
B.
when
C.
where
D.
that
【单选题】对下述材料进行相应的热处理时,可改善其切削加工性的方法是
A.
对铸件进行时效处理
B.
对高碳钢进行球化退火处理
C.
对中碳钢进行调质处理
D.
对低碳钢进行过冷处理
【单选题】The house ____ Lu xun used to live in is now a museum.
A.
that
B.
where
C.
which
D.
there
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