900句 T/Fquestion 749The pilots request right turn immediately to avoid traffic at 10 o’clock, 2 miles away.[音频]
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900句 T/Fquestion 755The approach lights look too bright because the aircraft is landing against the sun.[音频]
A. 对
B. 错
900句 T/Fquestion 765The pilots will carry out evacuation because of collision with another aircraft.[音频]
A. 对
B. 错
下列属原核细胞的生物是
A. 真菌
B. 变形虫
C. 细菌
D. 酵母
区别原核细胞与真核细胞的关键是
A. 有无核膜
B. 遗传信息量的差别
C. RNA和DNA 的区别
D. 有无细胞壁
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