问题
多项选择题
电气装置由架空线或含有架空线的线路供电,且当地雷电活动符合外界环境影响条件AQ2(雷暴日数>25日/年)时,应装设大气过电压保护。建筑物电气装置的大气过电压保护可采取()措施。
A.加滤波器
B.通过其他方法提供至少等效的电压衰减量
C.按照IEC60364-5-534(过电压保护电器)安装具有Ⅱ类保护水平的电涌保护器
D.加接闪器
答案
参考答案:B, C
电气装置由架空线或含有架空线的线路供电,且当地雷电活动符合外界环境影响条件AQ2(雷暴日数>25日/年)时,应装设大气过电压保护。建筑物电气装置的大气过电压保护可采取()措施。
A.加滤波器
B.通过其他方法提供至少等效的电压衰减量
C.按照IEC60364-5-534(过电压保护电器)安装具有Ⅱ类保护水平的电涌保护器
D.加接闪器
参考答案:B, C
阅读理解。 | ||||
Happy Birthday to Wally Welcome to Formosa Zoo! Our beloved Llama, Wally,will be 5 years old on Nov.14. Come and join us to celebrate his birthday.
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1.Llama is a(n) _____. | ||||
A.Zoo B.boy C.anima D.important day | ||||
2.Who can be invited to draw a picture of Wally? | ||||
A.Linda a high school student who loves drawing. B.Tony a father who loves drawing animals. C.Tom, an elementary school student who loves drawing. D.Susan, a college student who studies art. | ||||
3.How long will Wally’s birthday party last? | ||||
A.Thirty minutes. B.Two hours. C.Three hours. D.Four hours. | ||||
4.The Browns will visit Formosa Zoo on Nov.14.Who can get a special present? | ||||
A.Ted.He will draw a picture of Wally. B.Susan.She will send an email to Formosa Zoo. C.Mrs. Brown.She will help make cakes for Wally’s party. D.Mr. Brown.He has the same birthday as Wally. | ||||
5.Stella wants to learn a lot about Wally’s life and history.Which activity should she join? | ||||
A.Grandpa Lin’s Story Time. B.Picture Drawing. C.The Birthday Party. D.Best Wishes to Wally. |