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radiology 放射学; 使用无线电波的:
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【单选题】关于自耦变压器的叙述,哪组是错误的
A.
自耦变压器是X线机各部分电路供电的总枢纽
B.
自耦变压器可为升压变压器或降压变压器
C.
自耦变压器是一种单圈式变压器,电铁心和线圈组成
D.
小功率的自耦变压器多制成抽头式调压
E.
大功率的自耦变压器常制成两个绕组,其变比一般在1:300之间
【简答题】铁心是变压器的 路部分;线圈是变压器的 路部分.
【单选题】—What can you see in the picture? —I can see a farm. And there ______ a lot of animals on it. [ ]
A.
is
B.
are
C.
will be
D.
be
【简答题】How many things can you see in the night sky? A lot! a clear evening you might see the Moon and some planets. And thousands of sparkling stars , too. You can see even with a telescope. You might see s...
【单选题】— What can you see in the picture? — I can see a farm. And there _______ a lot of animals on it.
A.
is
B.
are
C.
be
D.
am
【简答题】How many things can you see in the night sky? A lot! On a clear night you can see the moon, some planets, and thousands of sparking stars. You can see even more with a telescope. You might see that ma...
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