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问题 单项选择题

右心功能不全的患者，较早出现的症状是（）

A.心悸胸闷

B.劳力性呼吸困难

C.颈静脉曲张

D.腹胀、食欲下降

E.下肢凹陷性水肿

答案

参考答案：D

选择题
I saw a woman running toward me in the dark. Before I could recognize who she was, she had
run back in the direction _____ she had come.

A. of which
B. by which
C. in which
D. from which
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单项选择题

（）步骤是塑制法制备蜜丸的关键工序

A.物料的准备

B.制丸块

C.制丸条

D.干燥
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