问题
选择题
In spite of these unexpected difficulties,the Chinese astronauts________to launch ShenzhouⅧ
successfully.[ ]
A. threatened
B. managed
C. offered
D. hesitated
答案
答案：B
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In spite of these unexpected difficulties,the Chinese astronauts________to launch ShenzhouⅧ
successfully.[ ]
A. threatened
B. managed
C. offered
D. hesitated
答案：B
位时鼻底与颏底的距离减去4～5mm，可作为确定垂直距离的数据。（）