A:
B:
C:
D:
一个瓶子最多能盛1000g水,用这瓶子盛煤油,最多可盛 ____ g.(ρ油=0、8×103kg/m3)
人类对细胞的认识得益于显微镜的发明.如果在显微镜视野中的图象是“b”,请问玻片上应为( )
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Good news! We'll have ____ one-day holiday in order to celebrate the 70th annzversary(纪念日)of the victory in World War II.