岩棉是以下列何种精选的岩石为主要原料，经高温熔融后，由高速离_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

岩棉是以下列何种精选的岩石为主要原料，经高温熔融后，由高速离心设备加工制成的（）

A.白云岩

B.石灰岩

C. 玄武岩

D. 松脂岩

答案

参考答案：C

解析：

岩棉系以精选玄武岩为主要原料，经高温熔融后加工而成，具有质轻、不燃、热导率小、吸声性能好、化学稳定性好等特点。

完形填空

完形填空。

     Do you know the Lazybones?Day? In Holland(荷兰) , Lazybones? Day is   the day   1        lazy
children．It is about seven weeks after Easter.Early in the morning on Lazybones?Day, children    2
through the streets. They laugh, they shout , and they beat (击打)the plates and    3     .  In other words,
they make as 4   noise as they can . They ring the doorbell   5    the door when they pass a house . If they
find a boy    6    a girl sleeping, they will shout loudly, "Lazybones, Lazybones!" and try their best to   7
him or her up. So the poor lazybones has to take out cakes . The children will help     8        to the cakes
and then they go back on to the street to find   another lazybones. The first lazybones , of course , joins
them and shouts as loudly   9   possible.Lazybones?Day started long ago becaus

e of a man named Piet
Lak. There was once a war 10 Holland and its neighbouring(邻近的) country. Piet Lak was a
watchman then , but he fell asleep while enemies(敌人) marched through Holland . After that people
called him Lazy Lak, and they remember the day as Lazybones?Day.

( )1. A.with
( )2. A.walks
( )3. A.bowl
( )4. A.much
( )5. A.on
( )6. A.and
( )7. A.awake
( )8. A.them
( )9. A.for
( )10.A.among

B. for
B. walk
B. bowls
B. many
B. in
B. but
B. wake
B. him
B.as
B. between

C. to
C. walking
C. a bowl
C. more
C. at
C. or
C. make
C. herself
C. so
C in

D. on
D. walked
D. the bowls'
D. lot
D. onto
D. while
D. let
D. themselves
D.be
D. on

单项选择题

可以早期鉴别葡萄胎和侵蚀性葡萄胎的检查是（）.

A.胸部X线摄片

B.刮宫葡萄胎标本

C.血清β-HCG检测

D.B型超声及彩色多普勒

E.子宫输卵管造影术或宫腔镜