问题
单项选择题
变压器二次侧电压为6kV或3kV的总开关，可采用隔离开关或隔离触头，当属( )情况之一时，应采用断路器。
A．出线回路较多
B．有并列运行要求
C．有继电保护和自动装置要求
D．可靠性要求高
答案
参考答案：A,B,C
解析： GB50053—1994《10kV及以下变电所设计规范》。
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变压器二次侧电压为6kV或3kV的总开关，可采用隔离开关或隔离触头，当属( )情况之一时，应采用断路器。
A．出线回路较多
B．有并列运行要求
C．有继电保护和自动装置要求
D．可靠性要求高
参考答案：A,B,C
解析： GB50053—1994《10kV及以下变电所设计规范》。
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cheaper in early summer. It is also cheaper to go there by plane than to go there by train, and it's easier to get a ticket in May than June, July and August. Most people think that Greece is prettier. Others say Spain is hotter and more expensive. Certainly hotels in Spain are more expensive than hotels in Greece, but also they are more comfortable (舒适的). Greece is much more interesting and it is far quieter than Spain. Spain is nearer and one can get there more quickly. But Spain can be very crowded. Some people feel that Greece is more beautiful, the air is cleaner and the sea is bluer. Also the food is simpler in Greece. People prefer (更喜欢，宁愿) Greece this summer. Greece is the better choice (选择). 根据短文内容，回答下列问题。 1. Which countries are more popular than France and Italy? ___________________________________________________________ 2. Which is the cheaper way to travel to Spain or Greece? ___________________________________________________________ 3. Which country is prettier? ___________________________________________________________ 4. Which country is more interesting? ___________________________________________________________ 5. Which country is more crowded? ___________________________________________________________ 6. Which country is the better choice for people in this summer? ___________________________________________________________ |