Please complete the summary of paragraphs C and D below.
请完成下面C和D段的总结。
Now, in class D, an instance of class C is constructed.
现在，在类D 中，构造了类C的实例。
We're now in Washington D. C., the capital city of America.
我们现在在华盛顿特区，美国的首都。
The test results show that commutation performance of the D. C. motor is better.
试验结果表明这种直流电动机的换向性能是较好的。
At the height of the d. o. t-c. o. m bubble, we solicited online donations at $5 a piece.
在网络泡沫达到至高点时，我们曾在网上以一次5美元为单位要求获得捐款。
Many of our embassy colleagues here tonight were in Washington, D. C. that day.
很多今晚在场的使馆同事那天也在华盛顿特区。
Bethesda, Maryland, near Washington D. C., is home to National Institutes of Health.
靠近华盛顿，位于马里兰州的贝斯达是美国国家卫生局的所在地。
Washington D. C. is the capital of America.
华盛顿特区是美国的首都。
Lots of cities have a local mystery writer and Pelecanos is the one for D. c.
很多城市都有一名神秘的当地作者，而佩雷·卡洛斯便是华盛顿特区的那位。
Swimming time of A, B, C groups were significantly longer than D group.
B、C三组的游泳时间均比D组要长，统计具有显著性差异。
Swimming time of A, B, C groups were significantly longer than D group.
B、C三组的游泳时间均比D组要长，统计具有显著性差异。
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