A project manager does not have much time to spend planning before the mandatory start date arrives．He therefore wants to move through planning as effectively as possible．Which of the following would you recommend ？（）

A．Make sure you have a completed preliminary project scope statement and then start the WB

B．Create an activity list before creating a network diagra

C．Document all the known risks before you document the high-level assumption

D．Finalize the quality management plan before you determine quality metric

男性，37岁，诊断风心病二尖瓣病变多年，4年前除心悸、气短外，出现足肿、尿少，体检有心房颤动，一直用地高辛和小量利尿剂治疗。地高辛的作用机制哪一项是错误的

A．降低心室舒张末压

B．直接使周围血管阻力下降

C．减慢心率

D．增加心肌收缩力

E．使心肌净耗氧量减少