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【单选题】
If sales are $300,000 and sales at the break-even point are $250,000, what is the margin of safety?A.
17%
B.
20%
C.
83%
D.
120%
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皮皮学刷刷变学霸
举一反三
【单选题】pH 改变,电极电势发生变化的电对是 ( )
A.
Fe 3+ / Fe 2+
B.
I 2 / I －
C.
MnO 4 － / Mn 2+
D.
Hg 2+ / Hg
【单选题】The boy ____ by the senior students because he walked in the school without any shoes. 绿本练习2
A.
was laughing
B.
was laughed at
C.
laughed at
【简答题】The boy _____by the senior students because he walked in the school without any shoes.
【单选题】根据玻尔理论, 氢原子系统的总能量就是
A.
原子系统的静电势能之总和
B.
电子运动动能之总和
C.
电子的静电势能与运动动能之总和
D.
原子系统的静电势能与电子运动动能之总和
【单选题】The boy _____ by the senior students because he walked in the school without any shoes.
A.
was laughing
B.
was laughed at
C.
laughed at
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