第11题: [单项选择]在心输出量不变时外周阻力加大对动脉血压的影响是()。 A. 收缩压升高比舒张压升高明显 B. 舒张压升高 C. 收缩压降低比舒张压降低明显 D. 收缩压升高 E. 脉搏压增大 参考答案:B 答案解析:舒张压的高低主要反映外周阻力的大小,外周阻力加大时,心舒张末期存留在主动脉内的血量增多,故舒张压升高,脉压也减小。
第19题: [单项选择]I urged all the students to take the initiative in their own hands to determine their goals for further pursuit rather than to depend on their teachers and their parents.() A. determine B. determining C. in determining D. for determining 参考答案:C 答案解析:
[解析] take the initiative in doing sth.“主动做某事”,因此答案为C。