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【单选题】
三相笼型异步电动机的起动方法有降压起动和( )。A.
自耦变压器降压起动
B.
星形-三角形降压起动
C.
直接起动
D.
变频起动
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举一反三
【简答题】下图是某地的潜水等水位线图,C处的潜水水位埋深是多少?
【简答题】Newspapers are very important in our daily life. Many people begin their day by reading the paper. In this way they learn what is going on in the world. Sometimes, however, they didn’t have the time t...
【简答题】II . Linking words and phrases are missing in the following sentences. Fill in the words or phrases listed above so that the relation between the two statements is made clear. 1. That daily paper enjo...
【简答题】阅读下面短文,根据短文内容判断正误。 Reading newspapers has become an important part of our life. Many people begin their day by reading the papers. In this way they learn what is going on in the world. Sometimes, h...
【简答题】Newspapers are very important in our daily life. Many people begin their day by reading the paper. ln this way they learn what is going on in the world. Sometimes, however, they didn't have the time t...
【简答题】下图是某地区潜水等水位线图，A、B两点水平距离为50m，图中的数字单位为m，试确定 若在C点处凿水井，至少打多深才能见到地下水？
【简答题】什么是转向盘的自由行程 ?一般范围应是多少?
【单选题】下图是某地区潜水等水位线图, A 、 B 两点水平距离为 50m ,图中的数字单位为 m , 若在 C 点处凿水井,至少打多少米才能见到地下水 。
A.
1
B.
2
C.
3
D.
4
E.
5
F.
10
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