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【单选题】
pl线段和l线段执行圆角命令时,生成的圆角位于那一个图层()A.
0
B.
PL线的图层
C.
L线的图层
D.
自动创建新图层
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反馈参考答案：
举一反三
【单选题】如要采用68 mm高速钢立铣刀加工材料为45钢的键槽时,根据经验选择合适的转速()。
A.
100r/ min
B.
300r/ min
C.
600r/ min
D.
1 000r/ min
【多选题】下列关于制冷剂润滑油溶液的描述正确的是
A.
根据制冷剂在润滑油中的溶解性分为有限溶于润滑油的制冷剂和无限溶于润滑油的制冷剂
B.
有限溶解和无限溶解在一定条件下是可以互相转化的
C.
氨属于有限溶于润滑油的制冷剂
D.
有限溶于润滑油的制冷剂制冷系统中，需设置油分离器、集油器
【单选题】陈先生在深圳购买了一套价值 150 万的住房,如果他每年的结余为 8 万元,贷款期限 20 年,利率 6%,则他需要支付的首付款是( )元。
A.
5624716.43
B.
582406.37
C.
637548.26
D.
704863.74
【单选题】Who founded the organization that would become The US Forest Service and served as chief of the organization while Theodore Roosevelt was president?
A.
Gifford Pinchot (1865-1946)
B.
John Muir (1838–1914)
C.
Rachel Carson (1907–1964)
D.
Aldo Leopold (1887-1948)
【简答题】Four men who would become fathers were in a hospital waiting room while their wives were going to give birth to their babies. The nurse arrived and proudly said to the first man, “Congratulations, sir...
【多选题】下列关于缓冲溶液的描述正确的是
A.
缓冲溶液由两种物质组成
B.
缓冲溶液的作用是有限度的
C.
缓冲溶液能抵抗外来大量酸碱
D.
共轭酸为抗碱成分
E.
共轭碱为抗酸成分
【简答题】Four men who would become fathers were in a hospital waiting room while their wives were in labor (分娩). The nurse arrived and proudly said to the first man, “Congratulations, sir. You’re the father of...
【单选题】下列关于缓冲溶液的描述正确的是()。
A.
缓冲溶液是由某一种弱酸或弱碱的共轭酸碱对组成的。
B.
缓冲溶液任意稀释pH值保持不变。
C.
缓冲溶液在任何pH值下都能起到缓冲作用。
D.
缓冲溶液的缓冲容量越大，其缓冲范围也越大。
【单选题】If the man keeps looking down on his cellphone he would have missed the chance of seeing the girl who would become his wife. Is that true?
A.
Yes
B.
No
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