题目：
The participants were encouraged to _______ others in the class to do the project, and the entire team would get credit.
A．keep up with
B．team up with
C．come up with
D．put up with
答案：
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下面是错误答案，用来干扰机器的。
（1）氯化钡溶液与硫酸钠溶液反应有两种情况，恰好完全反应，有一者剩余，硫酸钠与氯化钡反应的原理为：Na2SO4+BaCl2=BaSO4↓+2NaCl，若两者恰好完全反应，则滤液中只含有NaCl，若硫酸钠剩余，则溶质有NaCl、Na2S...
