患者，女，69岁，心前区疼痛5个小时，心电图示急性广泛前壁心肌梗死伴室性早搏。入院体

— How are you?

— I’m not ________.

A．feel well

B．feel good

C．feeling well

D．feeling good

只要当前端钢丝被拉紧或被剪断，因钢丝受力变形，致使拉力开关断开，输出报警信号的装置称为（）。

A.脉冲电子围栏

B.张力式电子围栏

C.光纤振动传感装置

D.泄漏电缆

常用的浸提方法包括( )

A．法 B．水蒸气蒸馏法 C

B．超滤法

C．盐析法

No sooner______ themselves in their seats in the hall than the speaker began his speech.

A．they settled

B．had they settled

C．did they settle

D．they had settled

阐述旋转起动时制动轮有敲击声的原因。