2. 专升本
  3. X-rays are able to pass through objects and thus make ______ details that are otherwise impossible to observe.

X-rays are able to pass through objects and thus make ______ details that are otherwise impossible to observe.

admin2008-01-17  50
问题 X-rays are able to pass through objects and thus make ______ details that are otherwise impossible to observe.
选项 A、it visible
B、them visible
C、visible
D、they are visible
答案C
解析
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