血浆脂蛋白主要结合的药物是（）。
A.偏酸性药物
B.偏碱性药物
C.中性药物
D.两性药物
E.解离型药物
参考答案：B
— Flight CA 581_____. I must be off now.
— Have a nice trip.[ ]
A. is being announced
B. has announced
C. was announcing
D. will be announced
受压薄板发生失稳时的临界应力越大，表示（）。
A.板的强度越好
B.板的刚度越好
C.板的稳定性越好
D.板的稳定性越差
