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【单选题】
功率放大电路的最高效率是指A.
输出功率和输入功率的百分比
B.
最大的不失真输出功率与电源提供功率的百分比
C.
输出功率与功放管上消耗功率的百分比
D.
电源提供的功率和输出功率的百分比
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【简答题】☆☆★★☆☆★★☆☆★★☆☆★★…左起第20个是______，前30个图形中有☆______个，★______个．
【单选题】将0.45g非电解质溶于30g水中，使水的凝固点降低0.15℃，已知H2O的Kb=1.86K·kg·，则该非电解质的摩尔质量(g·【图片】)是
A.
100
B.
83.2
C.
186
D.
204
【单选题】Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you ...
A.
$600,000.
B.
$4,000,000.
C.
$ 5,000,000.
D.
$5,000,000,000.
【简答题】阅读理解。 Early in the 16th century men were trying to reach Asia by traveling west from Europe. In order to find Asia they had to find a way past South America. The man who finally found the way from the...
【简答题】☆ ☆ ☆ ☆☆ ☆ ☆ ☆,有 ( )颗☆,每 2颗一份,分成了( )份。
【单选题】When will the dishes be reviewed?
A.
On October 25
B.
On October 30
C.
On November 7
D.
On November 15
【单选题】卡拉姆津不仅是 12 卷本的《俄罗斯国家史》的作者,同时还是俄罗斯感伤主义的代表人物。他创作的小说《 》,描写了美丽、纯洁的村姑丽莎与贵族花花公子青年艾拉斯特之间不幸的爱情故事。
A.
《苦命的丽莎》
B.
《瓦季姆·诺夫戈洛茨基》
C.
《五月的早晨》
D.
《月亮与六便士》
【单选题】听力原文： The United States has begun to review Russian documents about the life and death of former President John F. Kennedy and expected to release them once the review is complete, the White House sai...
A.
they cover the whole story of the former US president.
B.
the assassin used to live in the former Soviet Union.
C.
they are the only official documents released about Kennedy.
D.
they solved the mystery surrounding Kennedy's assassination.
【单选题】将0.45g非电解质溶于30g水中,使水的凝固点降低0.15°C,已知H2O的Kb=1.86K·kg·mol-1,则该非电解质的摩尔质量(g·mol-1)是
A.
100
B.
83.2
C.
186
D.
204
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