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1 "Rain repellent is used to improve visibility during heavy pre

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1 Electric heating is automatically supplied to selected areas o

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1 All flight deck windshields are electrically heated for anti-i

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1 The valve is closed to keep system fluid. 主语：the valve ?谓语: is

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1 "In the sentence,""Shut down the APU"", 谓语：shut down 宾语：the AP

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1 Non-approved blanks __________ not be used. should

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1 The safety pin __________ be removed before flight.

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1 Technical manuals __________ be conformed to during aircraft m

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1 The wheels __________ be damaged by a hard landing.

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Hot oil ___________ cause injury.

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