Only through constant practice can the ability of using a foreign language be _______.

A．earned

B．acquired

C．gained

D．achieved

关于T管护理叙述正确的是

A．胆总管下段阻塞时引流量增多

B．T管造影显示通畅即可拔管

C．正常胆汁色泽为深绿，较稀薄

D．下床活动时引流袋应高于腰部

E．T管阻塞时应加压冲洗