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【单选题】
乙类放大电路是指放大管的导通角等于( )。A.
360度
B.
180度
C.
90度
D.
小于90度
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【单选题】患者，男，36岁，入院前半月发热、咽痛，热退5天后感乏力、恶心、呕吐、少尿，体检：血压168／100mmHg，贫血貌，双下肢水肿，呼吸深长。心脏临界大小，实验室检查：血红蛋白60g/L，尿蛋白（++），血尿素氮41mmol／L，肌酐1002μmol／L。患者入院后相关检查结果为血钙1．56mmol／L，血磷3．2mmol／L，血钾6．0mmol／L，血钠122mmol／L，血氯89mmol／L，血...
A.
代谢性酸中毒，高血钾
B.
代谢性酸中毒，低钠血症
C.
代谢性酸中毒，高磷血症与低钙血症
D.
代谢性酸中毒合并呼吸性碱中毒
E.
高钾血症，低钠血症，高磷血症
【简答题】用戴维南定理计算如图所示电路中电阻 R 2 上的电流与电压。图中 U S = 12 V, I S = 2 A, R 1 = 2Ω , R 2 = 2Ω , R 3 = 2Ω 。
【单选题】听力原文：W: It doesn't look like you have vacuumed the living room or cleaned the bathroom. M: No, I haven't. You know, I had a worst day. I am so tired. Look, I promise I'll do it this weekend. W: Listen...
A.
He thinks it not dirty.
B.
He feels very bad.
C.
He is very tired.
D.
He has no time.
【简答题】图示电路中,已知:U S1 =30V,U S2 =24V,I S =1A,R 1 =6Ω,R 2 =12Ω,R 3 =12Ω。 用支路电流法求未知支路电流,I 1 =____A,I 2 =____A,I 3 =____A。 (此题为计算题,系统中仅提交答案,过程请写在作业本上)
【单选题】听力原文：W：Are you still planning to go to the concert? Your secretary gave me a call that you must be busy these days. M：You bet I am. I am so eager to take a part that this time I won't miss it. Q：What ...
A.
He'll go if the woman goes too.
B.
He doubts if he'll be able to go.
C.
He's too tired to go.
D.
He's eager to go.
【单选题】听力原文：W: Sam,you look pale as if you sat up late last night. M: Actually I went to bed earlier than usual.I am tired because I gave in to my son's earnest request and took him to the zoo yesterday. Q: ...
A.
He stayed up too late last night.
B.
He went to bed too early last night.
C.
He went to the zoo with his son yesterday.
D.
He worked overtime yesterday.
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