When a spacecraft travels, one of the major problems is reentry into the Earth’s _______. ( 章节：2 难度：1)_做题室

单项选择题When a spacecraft travels, one of the major problems is reentry into the Earth’s _______. ( 章节：2 难度：1): A、surface; B、atmosphere; C、attitude; D、bent

正确答案：B
答案解析：
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