[简答题]某用户为非有效接地系统高压计量有功电能分相接线方式，安装三相三线电能表，互感器二次回路安装试验接线盒，其接线方式为《电能计量装置安装接线规则》的标准接线。某次进行现场检验，检验人员在将现场校验仪电流低端接出的两根电流线接入试验接线盒相对应的段子时，结果把应接入U相端子的接入W相，把应接入W相端子的接入U相，且接入现场校验仪U相电压端子的电压线断线，其他接线正常。若二次功率实际值为600W，功率因数为0.866，当打开电流短接片使现场校验仪串接与被试表电流回路后，发现此时现场校验仪的功率指示400W，而被试表出现停走现象，请计算分析原因。

The West has begun to take more notice of the East. The fifth volume of an enormous work re- assessing the Chinese contribution to science and technology is to be published next year. The first volume, which was published twenty years ago, set the tone for the whole work. In it, evidence was given to show that many inventions which, until then, Western historians had claimed for Europe, were made first in China. The attempt to rewrite the intellectual history of the world was not received without protest by some famous historians. However, the evidence that has been presented so far in the first four volumes has persuaded many historians who were skeptical at first. China’s invention of paper, printing, the magnetic compass and gunpowder has never been disputed, but this new history has added advanced bridge design, mechanical clocks, paddle boats and many other inventions to the list.
In the four volumes published so far no attempt has been made to explain
A. doubtful
B. worried
C. sad
D. angry