结构中带有大量的负电荷，与血管内皮结合，保护血管内皮免受损伤

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问题单项选择题

结构中带有大量的负电荷，与血管内皮结合，保护血管内皮免受损伤而防治动脉硬化：

A．硝苯地平
B．DHA
C．藻酸双酯钠
D．洛伐他汀
E．硝酸甘油

答案

参考答案：C

填空题

两平行直线x+3y-4=0与2x+6y-9=0的距离是（）。

选择题

Faced with a bill for $ 10,000, ________________ .

A．John has taken an extra job

B．the boss has given John an extra job.

C．an extra job has been taken

D．an extra job has been given to John.