扁桃体的生理功能正确的是()
A．呼吸功能
B．吞咽功能
C．消化功能
D．免疫功能
E．共鸣功能
参考答案：D
—What were your parents doing when you phoned me last night?
—They ________with my grandparents.
A．were talking
B．talked
C．are talking
D．talk
泵用轴封填料的正确选用至关重要，通常应满足那些要求？试回答填料环预制的方法是什么？
