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【简答题】
现实生活中，氨气多用作致冷剂及农用化肥，其实它还是一种清洁能源，它在纯氧中完全燃烧生成水和氮气。最近，科学家用一种含钼的化合物作催化剂，在常温下就能完成氨的合成，从而大大降低了生产成本，使得液氨有望取代液氢成为新一代绿色能源．请你根据下表信息分析用氨取代氢气的优点： 颜色、气味 熔点（℃） 沸点（℃） 25℃水中溶解度（g/L） 标密度 （g/L） 氨气 无色、刺激性 ﹣77.7 ﹣33 456 0.6942 氢气 无色、无味 ﹣259.2 ﹣253 0.0015 0.0899 （1）由于氨气比氢气沸点 ，所以更易 ，便于储存和运输。 （2）氨气泄漏时易被发现是因为 ，同时它 ，便于处理。
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【简答题】测量三相电路功率时,不论电路是否对称
【简答题】Complete the following dialogues: 1. A: Our government encourages college students to be creative and start career planning early. What does this mean for your dream of a future job? B: As a college s...
【单选题】Look at the children. ______ they are laughing! [ ]
A.
How happy
B.
How happily
C.
What happy
D.
What happily
【单选题】Passage 1There are robots all around us. Some do very complicated jobs like flying airplanes and driving subway trains. And some do one simple job. When an automatic washing machine is switched on, wa...
A.
It has a computer brain.
B.
It cannot move.
C.
It has an eye.
D.
It can feel shapes and temperature.
【单选题】Look at the _____ girl! How_____ she is dancing! [ ]
A.
happy, happy
B.
happily, happily
C.
happy, happily
D.
happily, happy
【简答题】翻译:How happily the dolphin is playing!
【单选题】Passage 1There are robots all around us. Some do very complicated jobs like flying airplanes and driving subway trains. And some do one simple job. When an automatic washing machine is switched on, wa...
A.
A bus driver
B.
A machine with eyes and fingers
C.
A human engineer
D.
An automatic washing machine
【单选题】Passage 1There are robots all around us. Some do very complicated jobs like flying airplanes and driving subway trains. And some do one simple job. When an automatic washing machine is switched on, wa...
A.
Robots work because they like working.
B.
Robots work because they have feed back.
C.
Robots will get bored doing the same work over and over again.
D.
Robot’s electronic memory should not be wiped clean.
【单选题】_________ happily the children are flying kites! [ ]
A.
What
B.
What a
C.
How
D.
How a
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