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【单选题】
电视机出现开机后有光栅、无图像、无伴音的故障时,若更换频道故障仍然存在,则需要()。A.
更换频道看看故障是否存在
B.
检查 CPU 引脚电位
C.
检查电子调谐器的引脚电位
D.
检查天线输入端
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【简答题】氢气是未来最理想的能源，科学家最近研制出利用太阳能产生激光，并在二氧化钛(TiO 2 )表面作用使海水分解得到氢气的新技术：2H 2 O 2H 2 ↑＋O 2 ↑。制得的氢气可用于燃料电池。试回答下列问题 （1）水分解时，断裂的化学键为________键（填离子或共价），分解海水的反应属于________反应（填放热或吸热）。 （2 ）某种氢氧燃料电池是用固体金属化物陶瓷作电解质，两极上发生的电极...
【单选题】The United Kingdomis the______most populous country, with an estimated 66 million inhabitants in 2017.
A.
12th
B.
22nd
C.
2nd
D.
20th
【单选题】--- Both Li Lei and Han Meimei _______ fond of the TV program A Bite of China. ---- I am also deeply moved by its stories.
A.
is
B.
am
C.
was
D.
are
【简答题】农田、园林的喷灌装置一边喷水一边旋转,这是因为喷口的朝向稍有偏斜,水从喷口喷出时,弯管因反冲而旋转,这样可以自动改变喷水的方向。这里运用了 。(选填“动量守恒定理”或“动能定理”)
【单选题】_____ may reduce overall GHG emissions by about 13%, while that figure is around 88% or greater for cellulosic ethanol.
A.
Corn ethanol
B.
Corn
C.
ethanol
D.
fossil fuels
【单选题】Not only I but also Li Lei and Han Meimei ________ tired of so much homework every day. [ ]
A.
am
B.
is
C.
are
D.
was
【单选题】The report written by the marketing department showed that overall prices are up 7.5%_____the previous quarter.
A.
while
B.
since
C.
during
D.
within
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