【单选题】以蓝色均匀、体轻能浮于水面、火烧时产生紫红色烟雾的时间较长者为佳的药材是( )
【简答题】硅酸盐水泥中C 2 S早期强度低,后期强度增长多,而C 3 S,是对水泥强度贡献最多的矿物。
【判断题】硅酸盐水泥中C2S早期强度低,后期强度高,而C3S正好相反。
【单选题】The first step in the control process is ( )
A.
Measuring actual performance
B.
Establishing goals and standards
C.
Comparing results with objectives
D.
Take corrective action
【单选题】When sometimes they cannot enjoy adequate sleep, the long sleepers might ( ).
D.
be extremely depressed