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【单选题】
电路如图所示,开关在t=0时,断开,则电容电压的初始值为 V, 当t=∞, 电容电压为 V 。A.
6， 12
B.
12， 6
C.
4， 6
D.
6，4
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举一反三
【单选题】Tihe young ma n insisted he ____no thing wrong and that the police___him．
A.
did: released
B.
had done; release
C.
had done; must release
D.
should do; should release
【简答题】The young man at the counter had some sort of registration problem. It is _______ in the first year. The woman behind the counter clearly felt, as I did, _______ for this young man, who was _______ by...
【简答题】阅读短文，从 41～50 中选出正确答案。 A young man (Example: 0 ) going to join the army (军队) and had to 11 a medical examination. The doctor was sitting at a desk when he came in. He said to the man, “Take your coat a...
【单选题】关于窦房结的描述，错误的是
A.
窦房结位于上腔静脉和右心房结合部心外膜下
B.
呈椭圆形
C.
血液供应来自窦房结动脉
D.
窦房结内有普肯耶细胞
E.
主要受左侧神经的支配
【简答题】A young man was going to join the army and had to take a medical examination. The doctor was sitting at a desk when he went in. He said to the man. “Take your coat and shirt off, and sit on the chair....
【单选题】有关窦房结的描述，错误的是
A.
由神经细胞构成
B.
位于上腔静脉与右心房交界处的心外膜深面
C.
是心的正常心律的起搏点
D.
发出结间束至房室结
E.
血供多数来自于右冠状动脉
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