试题与答案

24岁初孕妇,孕24周,在急诊室主诉夜间突然 * * 流血,量少于月经,伴阵发性腹坠。检查

题型:单项选择题

题目:

24岁初孕妇,孕24周,在急诊室主诉夜间突然 * * 流血,量少于月经,伴阵发性腹坠。检查:BP:105/70mmHg,胎心率140次/分,胎位LOA,头浮,子宫有不规则收缩,无压痛。最可能诊断是()

A.先兆流产

B.胎盘早剥

C.胎盘边缘血窦破裂

D.前置胎盘

E.子宫颈息肉出血

答案:

参考答案:A

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题型:解答题
阅读下面解题过程,然后解答问题:
解方程:x4-x2-6=0
设y=x2,则原方程可化为y2-y-6=0,解得:y1=3,y2=-2
当y=3时,x2=3,∴x=±
3

当y=-2时,x2=-2,原方程无实数根.
∴原方程的解为:x1=
3
, x2=-
3

这种解方程的方法叫“换元法”.
仔细体会这种方法的过程步骤,然后按照上述步骤解下列方程:
x+1
x
-
2x
x+1
=1

设y=
x
x+1
,则原方程可化为关于y的方程:______
解得:y1=

.
, y2=

.

请你将后面的过程补充完整:
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题型:单项选择题

More and more residences, businesses, and even government agencies are using telephone answering machines to take messages or give information or instructions. Sometimes these machines give (1) instructions, or play messages that are difficult to understand. If you (2) telephone calls, you need to be ready to respond when you get a (3)

The most common machine is the (4) used in residence. If you call a home (5) there is a telephone answering machine (6) you will hear several rings and then a recorded message that (7) says something like this: "Hello. We can’t come to the (8) right now. If you want us to call you back, please leave your name and number after the beep." Then you will hear a "beep", (9) is a brief, high-pitched (10) . After the beep, you can say who you are, whom you want to speak to, and what number the person should call to (11) you, or you can leave a (12) . Some telephone answering machines record for only 20 or 30 seconds after the beep, (13) you must respond quickly.

Some large businesses and government agencies are using telephone answering machines to provide information on (14) about which they receive a large volume of (15) . Generally speaking, using these systems (16) you to have a touch-tone phone ( a phone with buttons rather than a rotary dial). The voice on the machine will tell you to (17) a certain button on your telephone if you want information on Topic A, another button for Topic B, and so on. You listen (18) you hear the topic you want to learn about, and then you push the (19) button. Immediately after making your (20) , you will hear a recorded message on the topic.

12()

A.repairing

B.recovering

C.retelling

D.recording

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