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【单选题】
四显示自动闭塞区段，车站控制台第一、第二、第三离去表示灯熄灭，办理发车进路后，出站信号机显示（）灯光。A.
绿色
B.
绿黄色
C.
黄色
D.
黄黄色
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举一反三
【简答题】什么条件下有源二端网络只存在戴维宁等效电路,不存在诺顿等效电路?
【单选题】What does James like about his job as a nanny?
A.
He has received encouragement from his friends.
B.
He can easily do better than women nannies.
C.
He has more freedom to plan his own work.
D.
He is allowed to try out unusual methods.
【单选题】--- Whose comic book is it? --- It ________ be Daniel’s. He often shares his comic books with his friends.
A.
must
B.
can’t
C.
mustn’t
D.
can
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