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搜题
【单选题】
P>0说明电路为()性质
A.
负载
B.
导线
C.
电源
D.
中间环节
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举一反三
【单选题】下列叙述中哪项与白消安不符
A.
加氢氧化钠加热产生似乙醚样特臭
B.
可以和 DNA 分子中鸟嘌呤核苷酸的N7 烷基化产生交联
C.
可以和氨基酸及蛋白质的巯基反应
D.
化学名为 1,4- 丁二醇二甲磺酸酯
E.
具脂溶性易于透过血脑屏障 , 适用于脑瘤及中枢神经系统肿瘤
【单选题】__ percent of the people in Queens are from another coumtry.
A.
15
B.
50
【简答题】某10kV电网,架空线路总长度70km,电缆线路总长度15km。试求此中性点不接地的电力系统发生单相接地故障时的接地电容电流,并判断该系统的中性点是否需要改为经消弧线圈接地。
【单选题】We know from the passage that__________
A.
French kings and queens ordered people to build another buildings as their palace home in 1350
B.
many treasures were brought into the Louvre in 1190
C.
Francis I came into power in l515 and damaged some buidings
D.
some works of art in the museum have been collected from man Y countries
【单选题】In Shelton's eyes, trying to convince intelligent people that man can return to health only on a basis of natural law
A.
may prove difficult.
B.
is impossible.
C.
should be easy.
D.
will need a great deal of argument.
【单选题】______percent of the people in Queens are from another country.
A.
15
B.
50
【简答题】某10kV电网,架空线路总长度70km,电缆线路总长度为16km。试求此中性点不接地的电力系统发生单相接地时的接地电容电流,并判断此系统的中性点需不需要改为经消弧线圈接地。
【判断题】People in Queens only speak English.
A.
正确
B.
错误
【单选题】已知某反应的反应物无论其初始浓度为多少, 反应掉其2/3时所需时间均相同, 则反应的级数为 :
A.
0 级
B.
1级
C.
2级
D.
3级
【简答题】某10kV电网,架空线路总长度70km,电缆线路总长度15km。 试求此中性点不接地的电力系统发生单相接地时的接地电容电流,并判断此系统的中性点是否需要改为经消弧线圈接地。
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