Bridge orders must be _____ and a record of any required changes in speed and direction sh

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• 3、The soda－acid portable extinguishers must be discharged and refilled _____.A.every six mon
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• 4、For there ______ successful communication there must be attentiveness and involvement in
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• 5、According to the theory of______ literature must be true to life and exactly reproduces r
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• 6、The police were given an order that the stolen documents must be recovered at all_________
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