施工单位进入变电站后，所放物品可随意摆放。
参考答案：错
口头传播包括（）
A.咨询、演讲
B.书籍
C.标本、模型
D.电影、电视
E.报刊、杂志
If 75 percent of a class answered the first question on a certain test correctly, 55 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly ？（）
A．10%
B．20%
C．30%
D．50%
E．65%
