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问题 判断题

蒸汽压高的油品比蒸汽压低的油品（在一定温度下）容易汽化。

答案

参考答案：对

选择题

如图（a）所示为一列简谐横波在t=20 s时的波形图，图（b）是这列波中P点的振动图线，那么该波的传播速度和传播方向是

[ ]

A．v=25 cm/s，向左传播

B．v=50 cm/s，向左传播

C．v=25 cm/s，向右传播

D．v=50 cm/s，向右传播

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单项选择题

Opal Company manufactures sophisticated machines and then leases them to its customers. If the leases are structured in such a way that they are treated as capital leases for accounting purposes, the impact on Opal’ s financial statements and ratios will be that all of the following will be higher EXCEPT :

A．

A. the total asset turnover ratio.

B．

B. return on equity (ROE).

C．

C. net cash flow.
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