胸膜腔有何特点?
参考答案：
胸膜腔左右各一，互不相通；胸膜腔内呈负压，含有少量浆液。
简答电压表的使用方法。
对划线部分提问
小题1:Mrs White is my English teacher.
_______ is _______English teacher.
小题2:Sally is a doctor.(同上)
_______ Sally?
小题3:There are three buildings in my school. (对划线部分提问)
_______ _______ buildings _______ _______ in your school?
