1. The“shareholders”as such had no knowledge of the lives，thoughts or needs of the workmen employed by the company in which he held shares，and his influence on the relations of capital and labour was not good． According to the passage，all of the following are true except that_________.
A. the shareholders were unaware of the needs of the workers
B. the old firm owners had a better understanding of their workers
C. the limited liability companies were too large to run smoothly
D. the trade unions seemed to play a positive rote
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在无限长载流导线的周围任意一点，如果不放置磁针，则该处:
A. 无磁场存在，有磁力存在
B. 有磁场存在，无磁力存在
C. 无磁场存在，无磁力存在
D. 有磁场存在，有磁力存在
医生利用听诊器分辨不同的心音，是根据：
A. 心跳的快慢
B. 层流能引起杂音
C. 湍流能引起杂音
D. 血压的大小
下面正确的是：
A. 一个闭合面中只要有磁感线穿过就有电流产生
B. 穿过闭合电路的磁通量越大，感生电流就越大
C. 穿过闭合电路的磁通量变化越大，产生的感生电流就越大
D. 穿过闭合电路的磁通量变化越快，产生的感生电流就越大
E. 穿过闭合电路的磁通量为零，产生的感生电流就为零
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