患者男性，矿工，由于煤井塌方被困于井下，仅靠地下水生存，20小时后获救，此时该患者主

If you left your book on the table overnight, you would find the following morning that it was still exactly when you had left it, provided nobody had moved it. If a ball is made to roll on a very smooth surface, it will roll a long distance unless something stops it or changes its direction. This tendency of an object to remain at rest unless something moves it and to continue moving unless something stops it is known as the Law of Inertia.
The following examples show the truth of this law.

• (a) Put a table-cloth on a table and arrange a pile of books on it. Hold one edge of the tablecloth and pull it quickly. The table-cloth will come off, leaving the pile of books undisturbed.
• (b) Place a small piece of cardboard on an open jar and place a coin on it directly over its mouth. Use one finger to flick the piece of cardboard away. You will notice that the coin drops into the jar.
• (c) Sitting in a car which starts suddenly, you feel you are jerked backwards. In fact, you are not jerked backwards. Your lower half, which is in contact with the cushion, is forced to move forward with the car, and the upper part of your body, which remained at rest, is left behind.

In the second example, when the cardboard is flicked away, the coin will ______.

A．drop into the jar

B．cover the mouth

C．stay on the cupboard

D．move into your hand

糖尿病是影响人们身体健康的一种常见病，临床表现为尿糖含量高，控制尿糖，是控制病情的常用途径．检验病情时，将尿糖检测试纸浸入热的鲜尿中，取出后，观察试纸颜色变红的程度，并与标准色卡进行比较，以确定尿糖的浓度，据此回答：

（1）尿糖试纸是将滤纸剪成小条，在一种浊液中浸润一段时间，再在一定条件下干燥而成．对该方法而言，这种浊液中的有效成分是______，该成份中决定其化学性质的原子团名称为______，该物质能发生的反应有______（填序号）①与活泼金属钠反应，②一定条件下与醋酸反应，③碱性条件下发生消去反应，④使灼热的黑色氧化铜变红，⑤一定条件下与氢气反应．

（2）这种方法用来检测尿糖的原理是______，其化学反应方程式为______．

下列机械传动中，（）可获得较大的降速比。

A.带传动 

B.链传动 

C.齿轮传动 

D.蜗杆传动

宽带综合业务数字B-ISDN的数据通信服务主要将采用_______。

A．帧中继技术

B．ATM技术

C．电话交换网技术

D．25技术

检查故障的方法有（）

A.直观法

B.短路法

C.切除法

D.替换法

E.测量法