急性左心衰竭应选用下列哪一种利尿剂（）
A.氢氯噻嗪
B.螺内酯
C.呋塞米
D.阿米诺利
E.氨苯蝶啶
参考答案：C
用质谱法测定苷类化合物分子量一般采用
A．EI
B．FAB
C．ESI
D．CI
E．FD
“ ______ as often as you can,” our English teacher often tells us, “ you will make rapid progress.”
A．Practice
B．To practice
C．Having practised
D．Practising
