(1)大家的眼睛都集中到了主席台上。(修改病句)
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(2)妈妈对我说:“你好好养病吧,我已经向你的老师请假了。”(改成第三人称转述句)
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(3)经过反复观测、分析和实验,他们终于制服了逞凶一时的冻土。(缩句)
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(4)中国人要在这样不良的地质上打隧道,是根本不可能的事!(改成反问句)
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同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2