1.After a great many loud explosions, the race began.
1.After a great many loud explosions, the race began.
Methane and air explosions occur in the well-known mixture range of 15% to 25% methane in air.
Methane and air explosions occur in the well-known mixture range of 15% to 25% methane in air.
Methane and air explosions occur in the well-known mixture range of 15% to 25% methane in air. A: 正确 B: 错误
Methane and air explosions occur in the well-known mixture range of 15% to 25% methane in air. A: 正确 B: 错误
Methane and air explosions occur in the well-known mixture range of 5% to ( )% methane in air. A: 10 B: 15 C: 20 D: 25
Methane and air explosions occur in the well-known mixture range of 5% to ( )% methane in air. A: 10 B: 15 C: 20 D: 25
6. My mind is always drawn back to that first day in the meadow, the explosions destroying the peaceful flowers and the naïve days of my childhood. (Para.9, L1)
6. My mind is always drawn back to that first day in the meadow, the explosions destroying the peaceful flowers and the naïve days of my childhood. (Para.9, L1)
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