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【判断题】
汽油是碳氢化合物的混合物。()A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】关于渠道断面的宽深比选择说法错误的是( )
A.
宽深比越小施工越困难
B.
宽深比越小渠床越容易稳定
C.
水力最优断面属于窄深式断面
D.
宽深比越小渠道流速越可能超过不冲流速
【判断题】“Hello/ Hi!” is the commonest form of greeting when people meet for the first time, and it’s a formal way of greeting.
A.
正确
B.
错误
【单选题】If in any doubt as to the pilot’s actions or intentions,the officer in charge of the navigational watch shall ______.
A.
notify the immediately
B.
take whatever action is necessary before the arrives
C.
take necessary actions at his/her discretion
D.
seek clarification [ˌklærəfɪ'keɪʃn] from the pilot
【简答题】In many cases, a “Hello” is a perfect way to greet someone in the US. “Hi” is also a suitable greeting. Both are typically said with a smile or a nod of the head. If you make eye contact with s...
【单选题】某车间有一台不频繁起动的笼型异步电动机，电气参数为：额定功率160kW，额定电压为交流三相380V，额定功率因数0.85，额定效率0.93，额定起动电流倍数7倍。该电动机由一台额定容量500kVA，电压10/0.4kV，阻抗电压4%的变压器供电。变压器到电动机由电缆连接，线路阻抗为0.01Ω。变压器一次侧短路容量为25MVA。变压器二次母线上其他负荷的无功功率为178kvar。电动机起动前变压器二...
A.
8.333MVA
B.
0.678MVA
C.
4.167MVA
D.
83.33MVA
【简答题】重合闸前加速需安装 套重合闸装置,主要用于 (填写电压等级)的发电厂或重要变电站引出的直配线上。
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