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【单选题】
第一心音的组成主要是由于A.
半月瓣开放
B.
心房收缩
C.
房室瓣关闭
D.
乳头肌收缩
E.
血流冲击大血管
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反馈参考答案：
举一反三
【单选题】What does the man suggest that the woman do?
A.
Go to another speech.
B.
Have lunch next door.
C.
Arrive for the seminar earlier.
D.
Wait until the speech is done.
【单选题】Why does the man have to go to work early this morning?
A.
He is working on a speech.
B.
He is leaving early to buy tickets for a ballgame.
C.
He is meeting with his boss.
D.
He is helping his cousin.
【简答题】某链条锅炉参数和热平衡试验测得的数据列于表3-8,试用正反热平衡方法求该锅炉的毛效率和各项热损失。
【单选题】What does the man want to do?
A.
Go travel．
B.
Go to the cinema．
C.
Have his hair cut．
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