题干

在显微镜的使用中,下列操作与结果不相符的是(    )

A:转动转换器﹣﹣更换物镜

B:转动粗准焦螺旋﹣﹣较大幅度升降镜筒

C:转动凹面镜﹣﹣调节视野亮度

D:b在显微镜下所成的像为p

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答案(点此获取答案解析)

B

同类题1

阅读下面短文,从短文后各题所给四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑
    I was walking around in a Big Bazar store doing a shopping, when I saw a cashier talking to a boy aged 5 or 6 years old," I'm sorry, 1you don't have enough money to buy this doll." Then the little boy turned to me and asked, "Uncle, are you sure I don't have enough money?"
    I2his cash and replied, "Yes, my dear." But he was still holding the doll in his hand.3, I walked toward him and asked him who he wished to give this doll to." It's the doll that my sister loves most. I want to4her for her birthday. I have to give the doll to my mommy so that she can give it to my sister when she goes there." His eyes were so5while saying this.
    "My sister has gone to be with God. Daddy says that Mommy is going to see God very soon too, so I thought that she could take the doll with her," My heart nearly6. "I hope my sister won't 7me."
    Then he looked down again at the8with sad eyes. I quickly9my wallet and said to the boy." Shall we check again, just10you do have enough money for the doll?" He agreed with hopeful eyes. I added some of my money to his11being seen. There was enough for the doll and even some12money.
    The little boy said," Thank you God for giving me enough money!" Then he added," I also wanted to buy a while rose for my mommy."
    I finished my shopping in a totally different13from when I started. I couldn't get the little boy14. Then I remembered a local newspaper article two days ago,which15a drunk man in a truck, who hit a car16by a young woman and a little girl. The little girl died17, and the mother was left in a critical state.
    I couldn't stop myself. I bought a bunch of white roses and went to the funeral home. The18that the little boy had for his mother and his sister is19, to this day, hard to imagine but20me a lot.