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工程机械控制装置用传感器按 检测对象 分常有: 温度传感器 、 , , 等4类。
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【单选题】听力原文：M: Professor Linda，we were wondering if we could sit in on your English class. W: I wish I could say yes，but if I accepted you two，I wouldn't know how to say no to a lot of others who have made t...
A.
She rejects their request.
B.
She accepts their request.
C.
She agrees to consider their request.
D.
She asks them to come with the others.
【单选题】There was _____to prevent the accident .
A.
something could do
B.
anything we could do
C.
nothing we couldn’t do
D.
nothing we could do
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