一个由5个部件组成的串联电子系统,5个部件的故障率分别为:λ1=0.0006/h,λ

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问题:

一个由5个部件组成的串联电子系统,5个部件的故障率分别为:λ1=0.0006/h,λ2=0.002/h,λ3=0.0015/h,λ4=0.0005/h,λ5=0.0004/h,则:

为了提高系统可靠性,应首先重点提高()的可靠性。

A.部件一

B.部件二

C.部件三

D.部件四

E.部件五

考点:质量工程师中级质量专业理论与实务中级质量专业理论和实务
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Dear Annie,

Thank you for your letter. I’m glad you like your school.

I go to school from Monday to Friday. We have four    1   in the morning and two in the afternoon. We have    2   to do after class.    3   Monday and Thursday afternoon we    4   sports. On Tuesday afternoon    5   of us have       6   singing class. And on Thursday afternoon some have a    7   class. On Friday afternoon we practice    8   English. My Chinese friends would like    9   with me in English. They think I am like an English teacher. Isn’t it great?

On Saturdays and Sundays I don’t go to school. Very often I go to the parks and have a good time    10   my family there.

(      ) 1. A.classes     B. lesson         C. class           D. grade

(      ) 2. A.anything     B. any things      C. many thing  D. many things

(      ) 3. A.To          B. In          C. On          D. At

(      ) 4. A.has         B.have        C. having         D. to have

(      ) 5. A.any        B. one         C. some       D. the other one

(      ) 6. A.a           B. an          C. the         D. some

(      ) 7. A.draw         B. draws       C. to draw     D. drawing

(      ) 8. A.speak        B. speaks       C. speaking    D. to speak

(      ) 9. A.talk        B. talks       C. to talk        D. talking

(      ) 10. A.for        B. with        C. at          D. in

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制浆废液

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患者,发热1周,逐渐不认家人,躁动不安,言语增多,错乱,常有幻觉。查体:不能合作,定向力障碍,注意力分散。 最可能的意识障碍类型是:()

A.意志缺乏症

B.谵妄状态

C.意识模糊

D.醒状昏迷

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为什么说在酸性溶液中,重铬酸钾是较强氧化剂,而不说铬酸钾是较强的氧化剂?

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胎盘合成的激素有().

A.蛋白激素

B.甾体激素

C.雌激素

D.孕激素

E.HCG

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