先天性脑积水突出的眼征是()
A.上睑下垂
B.落日征
C.眼肌麻痹
D.复视
E.突眼
参考答案:B
质量相等的两个实心小球甲和乙,已知它们的密度之比是ρ甲∶ρ乙=1∶3。现将甲、乙两球放入盛有足够多水的烧杯中,当甲、乙两球静止时,水对两球的浮力F甲∶F乙=3∶2,则甲、乙两球的密度分别是 和 。
The government of Chongqing is building _____ cheap and good houses for the people.[ ]
A. thousand
B. thousands
C. thousand of
D. thousands of