【判断题】【消耗次数：1】
PLC 完善的自诊断功能，能及时诊断出PLC 系统的软件、硬件故障，并能保护故障现场，保证了PLC 控制系统的工作安全性。
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when
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who
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that
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where
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shortly
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quickly
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temporarily
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what it takes
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what takes it
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what they take
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21.If it ________ tomorrow, the match would be put off.
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will rain
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were to rain
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was raining
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had rained
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4.The wedding ceremony is exactly ____ to coincide with his parents’ wedding anniversary.
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timing
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time
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happening
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clear
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scream
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jolt
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powerful
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violent
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will
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part from
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parted with
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