题目内容
词汇与结构An amber FAULT light on the APU control panel ______ whenever a fault or fire is sensed.
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词汇与结构When the inlet door is fully open, an electric starter engages, and the APU ______ to its normal operating speed.
词汇与结构The starter duty cycle is a maximum of 3 ______ starts or attempts within a 60 minute period with a 5 minute cooling period between attempts.
指出下列不正确的说法？( )
下列哪一种分子的去激发过程是荧光过程? ( )(1) 分子从第一激发单重态的最低振动能级返回到基态(2) 分子从第二激发单重态的某个低振动能级过渡到第一激发单重态(3) 分子从第一激发单重态非辐射跃迁至三重态(4) 分子从第一激发三重态的最低振动能级返回到基态
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