【简答题】当液压系统的工作压力高,环境温度高或运动件速度较慢时,为了减少泄漏,宜选用粘度较()的液压油;当工作压力低,环境温度低,或运动件速度较快时,为了减少功率损失,宜采用粘度较()的液压油。
【单选题】The _______ amongst the world’s scientists is that the world is likely to warm up over the next few decades.
【单选题】The expected return on a portfolio: I. can never exceed the expected return of the best performing security in the portfolio. II. must be equal to or greater than the expected return of the worst perf...
【判断题】单纯扩散是指不需要消耗任何能量的扩散。( )
【单选题】下面关于出纳工作交接的描述中不正确的是( )
B.
企业解散、破产、兼井、合并、分立等情况发生时,出纳人员应向接收单位或清算组移交
C.
出纳人员办理交接手续,由会计机机构负责人(会计主管人员)监交
D.
没有办清交接手续的出纳人员,经单位领导批准,可以调动或者离职
【简答题】当液压系统的工作压力高,环境温度高或运动件速度较慢时,为了减少泄漏,宜选用粘度较____的液压油;当工作压力低,环境温度低或运动件的速度较快时,为了减小功率损失,宜采用粘度较____的液压油。
【单选题】The ______ amongst the world's scientists is that the world is likely to warm up over the next few decades.
【单选题】下面关于出纳工作交接的描述中不正确的是()
B.
企业解散、破产、兼并、合并、分立等情况发生时,出纳人员应向接收单位或清算组移交
C.
出纳人员办理交接手续,由会计机构负责人(会计主管人员)监交
D.
没有办清交接手续的出纳人员,经单位领导批准,可以调动或者离职
【单选题】Amongst the 6 elementary DLL protocols:
A.
x stop-and-wait protocol uses piggybacking;
B.
For go-back-n protocol, receiving window = 1;
C.
For go-back-n protocol, sending window = MAX_SEQ;
D.
For selective repeat protocol, the sending window <= MAX_SEQ.