每一重复接地装置的接地电阻不得大于()。A、4Ω B、10Ω C、20Ω D、30Ω_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

每一重复接地装置的接地电阻不得大于()。

A、4Ω

B、10Ω

C、20Ω

D、30Ω

答案

参考答案：B

多项选择题案例分析题

患者男性，19岁。头晕、乏力、面色苍白半月余，近2天鼻出血、双下肢出现瘀斑入院。体检：腹股沟淋巴结可触及，蚕豆大小，胸骨下端压痛，肝肋下1.5cm，脾肋下2.0cm。实验室检查：RBC2.2×10¹²/L，Hb65g/L，MCV90fl，Hct20%，WBC20×10⁹/L，血小板30×10⁹/L

该患者若是急性早幼粒细胞白血病（M3型），骨髓象检查会出现的改变是（）。

A.骨髓细胞增生极度活跃或明显活跃

B.粒红比例明显增高

C.骨髓中异常早幼粒细胞增生为主，>30%

D.可见Auer小体

E.巨核细胞减小

F.可发现染色体t（15；17）易位

G.嗜碱性粒细胞增多

H.Ph染色体阳性

完形填空

It was a quiet morning during the war. In a small valley, there was a little wooden building, which was an orphanage (孤儿院) that__16__ many young children who had lost their ___17__ in the war. Suddenly, a shell (炮弹) __18__ on the top of the orphanage’s building. Many children were ___19__. One little girl was badly hurt and bleeding. A runner was at once sent to __20__medical help.
When the doctor arrived, he_21_ that the girl’s greatest need at the moment was blood. He immediately checked the records in the__22__ to find someone who had the same blood type as the girl’s. A nurse soon __23__the children that had the same blood type together and asked who would be __24__ to donate blood to the girl. The children looked shocked, and no one said a word. Again with __25____ eyes, the doctor pleaded (恳求). __26__ a boy slowly raised his hand.
When the doctor injected the needle, the boy began to cry. The doctor tried to _27__ him, but in vain. Even when the needle was _28__ , the little boy was still crying. After the blood was given to the wounded girl, her___29__ got better. Then the doctor came to the boy, "Does it hurt?" "No, but I was afraid of dying." The doctor was __30_! "Why did you think you would die? "With __31_ in his eyes the boy replied, "Because I thought you would take all of my __32__ to save her! "The doctor didn’t know what to say! Then he asked, "__33_you thought you were going to die, why did you__34__to give her your blood?" With tears streaming down, he said in a___35__ voice, "Because she is my friend and I love her." There is no greater love in the world!

C．regrettable

A．immediately

A．disappeared

D．embarrassed