下列是工厂供电过电流保护装置的是（）。①熔断器保护②低压断路

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问题单项选择题

下列是工厂供电过电流保护装置的是（）。①熔断器保护②低压断路器保护③继电保护

A、①②

B、②③

C、①②③

D、③

答案

参考答案：C

选择题

( ) 1.	A. I have a dog. Wow, how cute! B. I have an elephant. Cool!
( ) 2.	A. How many hamburgers? Five. B. How many hamburgers? Four.
( ) 3.	A. Can I have some Coke, please? B. Can I have some cake, please?
( ) 4.	A. Row the boat, please. B. Throw the plane, please.
( ) 5.	A. I like coffee. Me too! B. I like bread. Me too!

单项选择题

丹参的功效为

A．行血补血，润肠通便

B．活血祛瘀，舒筋活络

C．活血祛瘀，通经止痛

D．活血祛瘀，补肝肾，强筋骨

E．活血祛瘀，凉血消痈，养血安神