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【简答题】
阅读理解。 Plants are very important. This is because plants can make food from air, water and sunlight. Animals and man can not make food from air, water and sunlight. Animals can get their food by eating plants and animals. Man gets his food by eating plants and animals, too. So animals and man need plants in order to live. This is why there are so many plants around us. There are two kinds of plants: flowering plants and non-flowering plants. You can know some trees from their flowers and fruits. Non-flowing plants do not grow flowers. You can not see many non-flowering plants around you. If you look carefully at the plants around us, you will find that there are many kinds of plants. Some plants are large and some are small. Most of them are green. Thanks to (多亏了) the plants around us we can live on the earth. 1. Which is the most important for the plants? [     ] A. flower B. man C. animals D. air, water and sunlight 2. We need many plants around us because ______. [     ] A. we can get what we need from the plants B. plants are green C. plants grow easily D. we like all kind of plants 3. There are ______ non-flowering plants than flowering plants around us. [     ] A. much better B. much fewer C. much more D. much larger 4. Most of the plants are ______. [     ] A. green B. black C. yellow D. white 5. The best title (题目) is ______. [     ] A. Plants around us B. Food from plant C. Plants make food D. Man and animals
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【简答题】中国使用的Zigbee工作的频段是_______,定义了16信道。
【单选题】中国使用的ZigBee工作的工作频段是()。
A.
848MHz
B.
915MHz
C.
2.4GHz
D.
868/915MHz
【单选题】中国使用的zigbee工作的频段是()
A.
848MHZ
B.
915MHZ
C.
2.4GHZ
D.
868/915MHZ
【判断题】C-C 、C=C、C≡C三种化学键的键力常数K分别为4.5、9.6、15.6,它们的IR吸收峰的波数σ大小顺序是 (C=C) < (C-C)<(C≡C)。
A.
正确
B.
错误
【单选题】关于湿啰音的听诊特点,下列说法错误的是
A.
多出现于呼气相
B.
断续而短暂
C.
一次常 连续出现多个
D.
部位较恒定,性质不易变化
E.
咳嗽后可减弱或消失
【单选题】中国使用的Zigbee工作的频段是:( )
A.
915MHz
B.
2.4GHz
C.
868MHz
D.
433MHz
【单选题】中国使用的Zigbee工作频段是( )
A.
848MHZ
B.
900MHZ
C.
915MHZ
D.
2.4GHZ
【单选题】中国使用的 ZigBee 工作的频段是 。
A.
848MHz
B.
915MHz
C.
2.4GHz
D.
868/915MHz
【简答题】点A(x,2,3)与点B(-1,y,z)关于坐标平面yOz对称,则x=_____,y=______,z=______.
【单选题】中国使用zigbee工作的频段是()
A.
848MHz
B.
915MHz
C.
2.4GHz
D.
868/915MHz