【简答题】本实验任务之一是测定 套管 换热器 和 列管 换热器 两种换热器的传热系数,其中 套管 换热器 还分别测定__________ 和 两种情况下不同的传热系数
【简答题】设μ是X上的正测度,f:X→(0,∞)满足 .证明对每个使0<μ(E)<∞成立的X的子集E有 ,且当0<p<1时有
【单选题】. A passenger vessel is underway. when may passengers visit the pilothouse?
A.
Passengers are excluded in the pilothouse while underway.
B.
Passengers are permitted in the pilothouse during daylight hours only.
C.
Passengers are permitted to visit the pilothouse when authorized by the master and officer of the watch.
D.
Passengers are permitted in the pilothouse when they are escorted by a ship’s officer.
【单选题】下列选项中,不属于我国行政执法基本原则的是( )
【多选题】which substances belong to vitamin V