为了提高接收机的灵敏度，尤其是在外来信号很微弱时，增益控制电路应采用（）形式。 A.

单词拼写。

1. Brain's mother was very sad because her son was a________ of stealing things in the supermarket.

2. It doesn't make s________ to buy that expensive coat when these cheaper ones are just as good.

3. When you take pictures, you can push the b________ and then the camera works.

4. Adam is g________ and yesterday he ate all our biscuits!

5. Historically, clothing has been made from many m________ which range from grasses to furs.

6. Yesterday two men were badly injured in the accident and they were sent to hospital by a________

    as soon as possible.

7. P________ seems to be a natural part in our daily life in this competitive society, but we must reduce

    it and live a relaxed life.

8. The opening c________ of the 2010 Shanghai World Expo will be held on the night of April 30 this year.

9. A Canadian doctor has t_________ more than 100 patients in the earthquake.

10. The award was p________ to Lew in recognition of the high quality of his research work during these

      years.

男性，56岁，近1周腹痛，近3天乏力、头昏，逐渐出现活动时心慌、气短，平卧时缓解，无胸痛。查体：面色苍白，结膜苍白，BP90/60mmHg（12/8kPa），心率100次/分，呼吸26次/分，肠鸣音亢进。

首先考虑（）

A.急性心肌梗死

B.肺栓塞

C.消化道肿瘤

D.内脏破裂

E.上消化道出血

有关乙酰胆碱的叙述中，哪些是正确的（）。

A.神经末梢释放乙酰胆碱须有镁离子存在

B.与终板膜胆碱能受体结合产生去极化

C.其水解产物乙酸和胆碱于神经末梢经胆碱乙酰化酶的作用再合成乙酰胆碱

D.乙酰胆碱系被假性胆碱酯酶水解成乙酸和胆碱

E.在一定范围内，乙酰胆碱的释放随着钙离子浓度的升高而增加

台式钻床之主轴和钻头，在施压力钻削时，即停止转，可能的原因是（）。

A.皮带太紧

B.皮带太松

C.钻头夹得太紧

D.电掘线接反

使用编辑命令时，将显示“选择对象”提示，并且十字光标将替换为拾取框。响应“选择对象”提示有多种方法，下列选项最全面的是：（）。

A.一次选择一个对象

B.单击空白区域并拖动光标，以定义矩形选择区域

C.输入选择选项。输入以显示所有选择选项

D.以上说法均对