A:昼长小于夜长,且昼长逐渐变长
B:正午太阳高度逐渐变大
C:昼长大于夜长,且昼长逐渐变短
D:正午人影逐渐变短
—Sorry, but I _________ it for only half an hour. I haven't finished it.
A____;
B____ .
They can't buy anything because _________ of the shops are open now
在科学家眼里,二氧化碳是可以利用的重要资源.在一定条件下,二氧化碳和金属钠反应可以制金刚石CO2+4Na C(金刚石)+2Na2O,请计算92g金属钠理论上可制得含碳96%的金刚石的质量.