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问题 单项选择题

某产妇足月初产，第二产程2.5小时，胎盘娩出后有间歇性 * * 血多量，宫底增高应考虑为（）。

A.胎盘残留

B.凝血机制障碍

C.宫颈裂伤

D. * * 静脉破裂

E.宫缩乏力

答案

参考答案：E

填空题

根据句意和首字母提示完成单词。

l. There is a big tree in front of my house, and people often rest in the cool s_____  of the tree in summer.

2. Yuan Longping is famous for his h_____  rice.

3. He g_____   from the Southwest Agricultural University in 1953.

4. Yuan Longping has d_____  himself to research.

5. Yuan Longping was h_____ with the name "Father" of Hybrid Rice.

6. China now p_____  enough rice to feed her people every year.

7. In his s_____  time, he often writes some stories.

8. It is just a cold. N_____  serious.

9. Now Professor Yuan is working on d_____  super hybrid rice.

10. The farmer goes to the f_____  twice a day.
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填空题

如图所示，电灯L标有“4V 1Ω”，滑动变阻器的总电阻为50Ω，当滑臂P滑至某位置时，L恰好正常发光，此时电流表示数为0.45A，由于外电路发生故障，电灯L突然熄灭，此时电流表示数变为0.5A，电压表示数变为10V，若导线完好，电路中各处接触良好，则发生故障前，滑动变阻器接入电路的阻值为  ________Ω，电源的电动势大小为  _________V．
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