单项选择题
听力原文:W: I heard you received the top grade on all five exams this semester.
M: Only on four, I'm afraid.
What does the man mean?
A.He's afraid to take exams.
B.He only to0k the fourth exam.
C.He didn't get the highest score on one exam.
A.
M:
B.
What
C.He's
D.
B.He
E.
C.He
F.
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单项选择题
患者,男性,30岁,右胸外伤2小时入院。剧烈胸痛,气促。查体:面色苍白,1130次 分,P110次 分,BP90 64mmHg。气管左移,颈部可触及皮下气肿,右胸部挤压征阳性,听诊右肺呼吸音消失。该患者最可能的诊断是
A.张力性气胸
B.开放性气胸
C.单纯性气胸
D.右侧胸腔积液
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单项选择题
操作箱中的出口继电器动作电压动作要求()。
A.在55%-70%额定电压
B.在50%-70%额定电压
C.在50%-80%额定电压
D.在55%-80%额定电压
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