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.

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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中央信号回路的预告信号小母线1YBM、2YBM正确的接线是使其( )。 点击查看答案