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【单选题】
What is the final destination of Flight GE 64?
A.
Paris
B.
Miami
C.
New York
D.
Charlotte
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举一反三
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【判断题】轴承的通用画法特点是在剖视图中,当不需要确切地表示滚动轴承的外形轮廓、载荷特性、结构特征时,可用矩形线框及位于线框中央的正立十字形符号表示。
A.
正确
B.
错误
【单选题】下面那一个特殊辅助继电器为运行监控用,运行时即接通?
A.
M8000
B.
M8001
C.
M8002
D.
M8003
【单选题】It is difficult for us to learn a lesson in life __________ we've actually had that lesson. [     ]
A.
when
B.
after
C.
since
D.
until
【单选题】It is difficult for us to learn a lesson in life ______ we’ve actually had that lesson.
A.
until
B.
after
C.
since
D.
when
【单选题】I’ve already told you that the fourth and last part of the article ______ the most difficult to understand.
A.
is
B.
was
C.
are
D.
were
【单选题】塑松棍每条长度不足1.5m者,其人工乘以系数
A.
1.2
B.
1.3
C.
1.4
D.
1.5
【单选题】水泥中( )的存在会导致水泥混凝土中的钢筋发生锈蚀,所以应严格控制其含量。
A.
氧化镁
B.
三氧化硫
C.
氯离子
D.
碱含量
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