焊料焊中不包括A．火焰钎焊B．摩擦焊C．电接触钎焊D．高频钎焊E_爱下问搜题

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问题单项选择题

焊料焊中不包括

A．火焰钎焊
B．摩擦焊
C．电接触钎焊
D．高频钎焊
E．蓝浴钎焊

答案

参考答案：B

完形填空

阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中选出能填入相应空白处的最佳选项。
I ran into a stranger as he passed by. “I’m so sorry!” was my     . Then he said, “Excuse me too ... I didn’t even      you.” We were very    , the stranger and I. Then we went on our ways after saying     .
But at home, a different      is told. How we treat our      ones, the young and the old. Later, in the kitchen, as I cooked our supper, my      entered, very still. When I turned, I nearly knocked her down. “Get out of the way!” I      at her. She left, with her little heart broken. I didn’t      how hard I’d spoken.
That     , as I lay awake in bed, God’s quiet voice      to me and said, “While with strangers, you are polite,      with those you love, you didn’t do it properly. Go and look right now on the      floor, you’ll find some flowers there by the door. Those are the flowers she    __  for you. She picked them herself—pink, yellow and blue.”
By this time, I felt      and small and now my own      fell. I quietly went to her bed, “     up, my dear daughter.” I said. “Are these the flowers you picked for me?” She smiled, “I found them on the tree. I knew you’d like them,      the blue.” I said, “I’m so   __  that I missed them today ... And I shouldn’t have shouted at you that way.” She whispered(低声说), “Mommy, that’s okay. I still      you anyway.” I hugged her and said, “I love you too and love your flowers, especially the blue.”

C．dinning-room

选择题

下列有关共价键的叙述中，不正确的是（）。

A．某原子跟其他原子形成共价键时，其共价键数一定等于该元素原子的价电子数

B．水分子内氧原子结合的电子数已经达到饱和，故不能再结合其他氢原子

C．非金属元素原子之间形成的化合物也可能是离子化合物

D．所有简单离子的核电荷数与其核外电子数一定不相等