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【单选题】
In the sentence 'Because humans are at the top of the food chain, they are particularly vulnerable to the effects of nondegradable pollutants.', 'vulnerable' probably means ______.A.
defenseless
B.
protected
C.
strong
D.
fragile
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【多选题】遇到实验箱上PLC主机“POWER”灯未亮,你可以采用以下哪些措施
A.
检查实验箱开关，将其打开
B.
检查通讯线连接，将其插好
C.
打开电脑中的编程软件进行远程诊断
D.
低声询问周边同学
E.
不需要采取特别措施，不亮是正常的
F.
用万用表检查“L”、“N”端子之间电压，判断是否正常
【单选题】根据以下材料，回答题 I once had a friend that was diagnosed with， terminal cancer， and the news that he might only live up to six months was a great shock to him， his family， and his friends.However， in spite o...
A.
Satisfied.
B.
Surprised.
C.
Terrified.
D.
Confused.
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