问题
单项选择题
下列物质吸水性最强的是（）。
A、NaCl
B、BaS04
C、CaCl2
D、无法判断
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
下列物质吸水性最强的是（）。
A、NaCl
B、BaS04
C、CaCl2
D、无法判断
参考答案：C
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| The moon travels around the earth. It is our satellite. Man 1 it already. So far no man has traveled 2 than the moon, but spaceships without people 3 other parts of the universe. Many countries have sent man-made satellite into space. These satellites go round the earth and help us 4 more about the earth, the weather and 5 things. Most countries use these satellites to send and receive 6 . For example,with their help, China can send its TV and radio programs to the other parts of the world. We can also use 7 to help us make telephone calls to foreign countries. Our knowledge of the universe 8 all the time. Our knowledge grows and the universe develops. Because of space satellites the world 9 is becoming much 10 and people from different countries now can understand each other better.
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