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【单选题】
下列关于电磁波相速度的描述错误的是（ ）A.
相速度表示电磁波的等相位面在空间中的移动速度
B.
相速度的单位为
C.
电磁波在自由空间中的相速度为光速
D.
理想介质中均匀平面波的相速度与媒质参数无关
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【单选题】在完工产品成本中，如果月初在产品定额变动差异是负数，则说明（ ）
A.
本月定额管理和成本管理有成绩
B.
本月定额管理和成本管理有缺点
C.
消耗定额降低了
D.
消耗定额提高了
【单选题】A situation in which accepting one investment prevents the acceptance of another investment is called the:
A.
net present value profile.
B.
operational ambiguity decision.
C.
mutually exclusive investment decision.
D.
multiple choices of operations decision.
【单选题】A situation in which accepting one investment prevents the acceptance of another investment is called the:
A.
net present value profile.
B.
operational ambiguity decision.
C.
mutually exclusive investment decision.
D.
issues of scale problem.
【单选题】在完工产品成本中，如果月初在产品定额变动差异是正数，说明（ ）。
A.
定额提高了
B.
定额降低了
C.
本月定额管理和成本管理不利
D.
本月定额管理和成本管理取得了成绩
【单选题】Which of the following is not included in the investment component of GDP?
A.
The purchase of 100 shares of stock.
B.
The purchase of a $1000 bond.
C.
A firm’s purchase of a used van to use for deliveries.
D.
None of the above are included in the investment component of GDP.
【单选题】In which investment category are fair values and subsequent growth of an investee not relevant for reporting?
A.
Securities reported under the equity method.
B.
Trading securities.
C.
Securities available for sale.
D.
Held-to-maturity securities.
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