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【单选题】
在Y=a+（ ）x中，Y表示总成本，a表示固定成本，x表示销售额，则x的系数应是（ ）。A.
单位变动成本
B.
单位边际贡献
C.
变动成本率
D.
边际贡献率
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皮皮学刷刷变学霸
举一反三
【单选题】Finally she outside the farmhouse and got out of the lorry.
A.
pulled down
B.
pulled out
C.
pulled ahead
D.
pulled up
【单选题】Although she ______for a moment about the job，she finally accepted it considering the benefits of it.
A.
hesitated
B.
paused
C.
stopped
D.
wondered
【单选题】In the sentence 'She finally decides to join the party', the relationship between 'she' and 'decides' is called______.
A.
aspect
B.
tense
C.
government
D.
agreement
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