有花植物和传粉动物的______是自然界中最普遍的现象。
参考答案:互利共生
A : Can you tell me a little about Mexico City?
B : ___小题1:____. What would you like to know?
A : Well, what is a good time to visit?
B : _____小题2:______ The weather is always nice.
A : Oh, good! _____小题3:______.
B : Well, you should visit the National Museum and go to the Palace of the Fine Arts.
A : ________小题4:_______________ .
B : Oh, you shouldn’t miss the Pyramid of the Sun. _____小题5:____.
A : It sounds really exciting.
某温度下,在50mLCCl4溶液中含有0.568gI2,加入500mL水,充分振摇后,测得水相中含碘0.000233mol,则此分配系数为()。
A.0.116
B.86.1
C.0.00448
D.22.3。