局麻药的离解受溶液氢离子浓度的影响。()
参考答案：对
浪费时间的内部因素是（）
A.资料不全
B.计划欠妥
C.权责混淆
D.沟通不良
The senator agreed that his support of the measure would jeopardize his chances for reelection.
A．benefit
B．endanger
C．hinder
D．disturb
