焦虑性神经症的主要临床特点包括( )。
A．强迫性情绪
B．焦虑性情绪
C．紧张性不安
D．运动性不安
参考答案：B,C,D
---Jack hasn’t paid for his education, has he?
---________. His uncle will come and pay this afternoon.
A．Yes, he has.
B．No, he hasn’t
C．Yes, he did.
D．No, he didn’t.
选择法兰垫片时通常要根据（）因素选择。
A、法兰螺栓形式
B、介质温度
C、介质压力
D、工艺介质
