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【单选题】
下列关于磁感线的说法正确的是( )A.
磁感线可以形象地描述磁场中各点的磁场方向，它每一点的切线方向都与小磁针放在该点静止时S极所指的方向相同。
B.
磁感线总是从磁体的N极出发，到磁体的S极终止。
C.
磁场的磁感线是闭合曲线。
D.
磁感线就是细铁屑在磁铁周围排列成的曲线，没有细铁屑的地方就没有磁感线
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【简答题】When the pressure gets low, the boiling-point becomes low.
【简答题】When the pressure gets low, the boilling-point becomes low.
【简答题】操作系统的基本特性是
【判断题】As a rule ,when the pressure of the reservoir is high,the rate of production is low; but when the pressure is low,the rate is high.
A.
正确
B.
错误
【简答题】Changes in the prices of goods can cause changes in production and consumption. Production increases when the prices are high. As the prices of goods go up, producers make more goods because they can ...
【单选题】When the costs of supplies increase in an industry, the low-cost leader
A.
may continue competing with rivals on the basis of product features.
B.
will lose customers as a result of price increases.
C.
will be unable to absorb higher costs because cost-leaders operate on very narrow profit margins.
D.
may be the only firm able to pay the higher prices and continue to earn average or above- average returns.
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