嗜铬细胞瘤患者查24h尿儿茶酚胺及代谢产物，收集尿液前最好停用所有药物，包括降压药。
参考答案：对
下列各项对诊断伤寒最有意义的是（）
A.稽留热
B.血细菌培养阳性
C.脾肿大
D.肝肿大
E.相对缓脉
Why does the speaker think some students don’ t like history
A．History teachers don’t care.
B．Students are too lazy.
C．The professors don’ t make it interesting.
D．Students think history is not important.
