Which compound has a higher boiling and melting point? ionic compound or covalent compound? Why?2 個解答化學1 十年前
If 0.8448< a < 0.8452, which of the following must be true?
A. a= 0.9 ( cor.to 1 sig.fig.)
B a= 0.85 ( cor. to 2 sig.fig.)
C a= 0.845 (cor. to 3 sig. fig.)
D a= 0.8450( cor.to 4 sig. fig)
Why the answer of this question is C not D? If the answer is C, the value of a could be 0.8453 or above, which is greater than 0.8452.2 個解答數學1 十年前
Can you help me to solve 2 questions?
(1)-- In Polar co-ordinate, how could I find the mid- point of a line? For example, I have 2 points (2, 240) and (11,150). I use a line to link the points. Then, what is the mid. point of the line?
(2) 3a^3 + 3a^2 +1 = 0 , find a.2 個解答數學1 十年前
I know that the inheritance of a characteristic which is controlled by 1 single gene can be explained by studying monohybrid inheritance. However, if the inheritance of a characteristic which is controlled by more than 1 single gene , can i use monohybrid inheritance to explain it?1 個解答生物學1 十年前