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【单选题】
PLC控制系统能取代继电器接触器控制系统的()部分。A.
整体
B.
主电路
C.
接触器
D.
控制电路
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举一反三
【单选题】用紫外光照射某双原子分子,使该分子电离出一个电子并发现该分子的核间距变短了,该电子是
A.
从成键 MO 上电离出的
B.
从非键 MO 上电离出的
C.
从反键 MO 上电离出的
D.
不能断定从哪个轨道上电离出的
【单选题】听力原文：Why are you walking so quickly? (A) Sue talks very fast. (B) I'm late for a meeting. (C) They enjoy walking. (13)
A.
B.
【单选题】听力原文：W: Something is definitely bugging you．Why are you walking up and down the room? M: It's this presentation I have to give tomorrow．I'm a bit worried but I'll get over it by then. Q: What does the...
A.
He's worried about whether he can finish his presentation tomorrow.
B.
He's nervous but he believes he'll be better tomorrow.
C.
He's nervous about his presentation because he's unprepared.
D.
He'll finish writing his presentation tomorrow.
【单选题】用紫外光照射某双原子分子， 使该分子电离出一个电子。如果电子电离后该分子的核间距变短了， 则表明该电子是：
A.
从成键分子轨道上电离出的
B.
从非键分子轨道上电离出的
C.
从反键分子轨道上电离出的
D.
不能确定从哪个轨道上电离出的
【单选题】用紫外光照射某双原子分子，使该分子电离出一个电子并发现该分子的核间距变短了，该电子是
A.
成键 MO 上电离出的
B.
从非键 MO 上电离出的
C.
从反键 MO 上电离出的
D.
不能断定从哪个轨道上电离出的
【单选题】用紫外光照射某双原子分子，使该分子电离出一个电子，如果电子电离后该分子的核间距变短了，则表明该电子是
A.
从成键 MO 上电离出的
B.
从反键 MO 上电离出的
C.
从非键 MO 上电离出的
D.
不能断定是从哪个轨道上电离出的
【单选题】-Why are you walking to school? -______ the bus broke down on the way. [ ]
A.
If
B.
Since
C.
Because
D.
Though
【单选题】—Why are you walking to school? —Because my ______ is broken. [ ]
A.
radio
B.
watch
C.
bike
D.
bag
【单选题】－－－ Why were you absent yesterday? －－－ I caught a cold, _______I had been walking around in the ra
A.
2．--- Why were you absent yesterday? --- I caught a cold, _______I had been walking around in the rain. A．but
B.
so
C.
and
D.
For
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