常用的开关电器有哪些?他们各有什么功能?
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奔腾芯片有两条整数指令流水线和一______流水线。
完形填空。 | ||||
My grandfather and 1_______ go to the park near my house. There 2_______ many people in the park. There are many men and 3_______ talking. There are many children playing and 4_______. Anna and I 5___ ___ up high in a tree. Now we are scared. " Help! " Everyone looks 6_______ me. My grandfather sees Anna and 7_______ in the tree. He runs to the tree and 8_______ Anna and me down. I 9_______ okay, 10_______ Anna hurts her fingers.
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晓光同学发现,在关闭冰箱门后立即打开冰箱门和过一段时间再打开冰箱门,所用力的大小不同,立即打开冰箱门用力小.他对该现象感到奇怪,经查阅有关资料知:关闭冰箱门后,冰箱内的气体温度降低,气体压强变小.晓光同学明白了其中的原因.
晓光家的冰箱门长为60cm.宽为50cm,当冰箱外的气压为1.0×lO5Pa,如果冰箱内的气压比冰箱外的气压小千分之一,打开冰箱门需要克服由于内外压强差产生的阻力为______N.请你举出生活中与之类似的一个现象.并加以简要说明.
原发性脊柱侧弯是指()
A.由遗传因素引起的脊柱侧弯
B.由脊柱骨骼病变引起的脊柱侧弯
C.由脊柱旁肌肉病变引起的脊柱侧弯
D.由神经病变引起的脊柱侧弯
E.无明确原因的脊柱侧弯
《微雨之街》的作者是()。