【单选题】1+1,2+3,3+5,1+7,2+9,3+11,1+13,…第40项为( )
【单选题】已知点A(-3,-4),B(6,3)到直线l:ax+y+1=0的距离相等,则实数a的值等于( )
【多选题】The principles of the Guide for the Care and Use of Laboratory Animals (8th Edition, 2011) are:
A.
Consideration of alternatives (in vitro systems, computer simulations, and/or mathematical models) to reduce or replace the use of animals
B.
Design and performance of procedures on the basis of relevance to human or animal health, advancement of knowledge, or the good of society
C.
Use of appropriate species, quality, and number of animals
D.
Avoidance or minimization of discomfort, distress, and pain
【多选题】泡茶的五字要领为:神、()、()、()、巧。
【单选题】若sin( π 3 -a )= 1 3 ,则cos( π 3 +2a )( )
【单选题】European conservatives, until the end of the 19th century, rejected democratic principles and institutions. Instead they opted for monarchies or for authoritarian government.
【单选题】在建设工程进度计划执行过程中,当出现的进度偏差影响到后续工作或总工期而需要采取进度调整措施时,应当首先( )
【单选题】若 sin( π 3 -α)=- 1 3 ,则 cos( π 3 +2α) =( )
【简答题】A.Threat from weapons. B.Influence of violence on TV. C.Changes of moral principles. D.The unknown reason.