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【判断题】
在空间直角坐标系中, 方程 , , 分别为 椭圆柱面 , 柱面 和 抛物柱面.A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】民用建筑工程验收时，环境污染物浓度现场检测点应距内墙面不小于( )m、距楼地面高度0.8～1.5m。检测点应均匀分布，避开通风道和通风口。
A.
0.1
B.
0.2
C.
0.3
D.
0.5
【单选题】Which of the following can NOT be seen as a difference between Brazilian and American negotiators7
A.
Americans prepare more points before negotiations.
B.
Americans are more straightforward during negotiations.
C.
Brazilians prefer more eye contact during negotiations.
D.
Brazilians seek more background information.
【单选题】The government cannot compromise too much to the teachers unions because ______.
A.
the negotiations are ineffective
B.
the strike is actually under control
C.
it will set an example for other unions
D.
the teachers' unions will demand more
【简答题】Complete the summary with key information from the passage. More than one answer may be possible. A car crash which 1. of her brother forced the narrator to go to her hometown. With the house in disar...
【单选题】由于难加工材料的( ),有些材料还有较强的化学亲和力,所以,切削难加工材料时铣刀的磨损速度也较快。
A.
强度高、塑性大
B.
热强度高、切削温度高
C.
塑性大、切削力大
D.
加工硬化严重、强度高、热强度高、切削温度高、塑性大
【单选题】Which of the following can NOT be seen as a difference between Brazilian and American negotiators?
A.
Americans prepare more points before negouations．
B.
Americans are more straightforward during negotiations．
C.
Brazilians prefer more eye contact during negotiations．
D.
Brazilians seek more background information．
【简答题】A car crash which 1. of her brother forced the narrator to go to her hometown. With the house in disarray, she could not focus. Her husband decided to tell 2. what happened, including Donna, with whom...
【单选题】由于难加工材料的( ),有些材料还有较强的化学亲和力和粘合现象,所以,切削难加工材料时铣刀的磨损速度也较快。
A.
强度高、塑性大
B.
热强度高、切屑温度高
C.
塑性大、切削力大
D.
加工硬化严重、强度高、热强度高、切屑温度高、塑性大
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