关于胎膜早破的护理，下列哪项是错误的A．破膜后立即听胎心 B．_爱下问搜题

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问题单项选择题

关于胎膜早破的护理，下列哪项是错误的

A．破膜后立即听胎心

B．卧床休息，防止脐带脱垂

C．保持会阴清洁

D．可下地活动

E．破膜后注意体温、脉搏及呼吸变化

答案

参考答案：D

计算题

如图，匀强磁场的磁感应强度方向垂直于纸面向里，大小随时间的变化率＝k，k为负的常量。用电阻率为ρ、横截面积为S的硬导线做成一边长为l的方框。将方框固定于纸面内，其右半部分位于磁场区域中，求：

(1)导线中感应电流的大小；

(2)磁场对方框作用力的大小随时间的变化率。

填空题

An Event of Imagination

The year is 2094. It has been announced that a comet is heading towards the Earth. Most of it will miss our planet, but two pieces will probably hit the southern half of the Earth.
On 17 July, a piece about/for four kilometers wide enters the Earth’s atmosphere with a massive explosion.
About half of the piece is destroyed, but the remaining part hits the South Atlantic at 200 times the speed of sound. The sea boils and a huge hole is made in the seabed. Huge waves are created and spread outwards from the hole. The wall of water, a kilometer high, rushes towards southern Africa at 800 kilometers an hour. Cities on the African coast are totally destroyed and millions of people are drowned.
Before the waves reach South America, the second piece of the comet lands in Argentina.
Earthquakes and volcanoes are set off in the Andes Mountains. The shock waves move north into California and all around the Pacific Ocean. The cities of Los Angeles, San Francisco and Tokyo are completely destroyed by earthquakes. Millions of people in the southern half of the earth are already dead, but the north won’t escape for long. Because of the explosions, the sun is hidden by clouds of dust, and temperature around the world falls to almost zero. Crops are ruined. The sun won’t be seen again for many years. Wars break out as countries fight for food. A year later, no more than 10 million remain alive.
Could it really happen In fact, it has already happened more than once in the history of the Earth. The dinosaurs (恐龙) were on the Earth for over 160 million years. Then 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a piece of object in space. The dinosaurs couldn’t live through the cold climate that followed and they died out. Will we meet the same end

Reasons	Results
One piece hits the South Atlantic at 200 times faster than the speed of sound.	The sea (46) and a huge hole is made in the seabed. A tsunami(海啸) hits southern Africa, (47) cities on the African coast, and (48) millions of people.




A (49) (50) happens when the four-kilo- meter-wide piece of comet enters the Earth’s (51)	The sun is (52) . by clouds of dust and the temperature falls to almost zero, (53) crops. Wars break out for food and only 10 million people remain. The human beings are (54) the danger of (55) out.