A. 删除输入的字符 B. 复制输入的字符 C. 将字符复制到任意位置 D. 恢复字符
A. stop the engine by cutting off the cooling water supply B. stop the engine by closing the air intake C. slow the engine but not stop it D. slow the engine to half of normal load
A. 6～9dB B. 4dB C. 9～13dB D. 20dB
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