题目内容

Translate the following English to Chinese.Seal of the United States Department of Homeland Security. A graphically styled American eagle appears in a circular blue field. The eagle's outstretched wings break through an inner red ring into an outer white ring that contains a circular placement of the words "U.S. DEPARTMENT OF" in the top half and "HOMELAND SECURITY" in the bottom half. The outer white ring has a silvery gray border. As in The Great Seal, the eagle’s left claw holds an olive branch with 13 leaves and 13 seeds while the right claw grasps 13 arrows. Centered on the eagle's breast is a shield divided into three sections containing elements that represent the homeland "from sea to shining sea." The top element, a dark blue sky, contains 22 stars representing the original 22 agencies and bureaus that have come together to form the department. The left shield element contains white mountains behind a green plain underneath a light blue sky. The right shield element contains four wave shapes representing the oceans, lakes and waterways alternating light and dark blue separated by white lines.

查看答案
更多问题

巴比妥药物镇静和抗癫痫作用的强度和起效的快慢,主要与药物的理化性质即药物的酸性解离常数pKa和脂水分配系数有关,为()。

A. 结构特异性药物
B. 结构非特异性药物

药物与受体可逆的键合方式不包括()。

A. 离子键
B. 氢键
C. 范德华力
D. 共价键

酰胺易与生物大分子形成()键,增强与受体的结合,显示很好的多种生物活性。

A. 离子键
B. 氢键
C. 疏水键
D. 共价键

关于结构对于药效的影响,下面说法正确的是( )。

A. 几何异构体的生物活性有较大的差别。
B. 手性药物的对映体之间在药理活性及在体内的吸收、转运、分布、代谢和排泄等常有明显的差异。
C. 药物结构相同,构象不同,作用于不同受体,产生不同性质的活性。
D. 对映异构体都具有相同类型的活性,可能强度不同。

答案查题题库