将一个充满CO2的试管倒插在澄清石灰水的烧杯里,可观察到的现象是:____;____.
—____ are you going to play football?
一This afternoon.
为克服军队中“将不识兵、兵不识将、将无常兵、兵无常将”带来的弊端,王安石采取的措施是