According to different operation methods, reservoir operation can be divided into： A: conventional reservoir operation and optimal reservoir operation B: flood control operation, hydropower generation operation, comprehensive operation C: long-term operation, short-term operation, real-time operation D: single reservoir operation and multiple reservoir operation

The connotation of mathematical operation is to solve mathematical problems according to operation rules on the basis of clarifying operation objects. It mainly includes understanding the operation object, mastering the operation rules, exploring the operation direction, selecting the operation method, designing the operation program and obtaining the operation result. Is this statement correct?

I'd like to take ______of this opportunity to thank you for your co-operation. A: advantage B: occasion C: benefit D: profit

I’d like to take_______ of this opportunity to thank you all for your co-operation. A: profit B: benefit C: advantage D: occasion

In a hydraulic transmission system typical operating modes include manual operation、( )、( )、( ) and electro-hydraulic operation。

According to what we learn ,which one is right? () A: on<br/>the operation time we can touch the hair B: on<br/>the operation time we can touch the operation field C: on<br/>the operation time we can touch the floor D: on<br/>the operation time we can touch the back said

The operation was ___________ (success).

In a randomized complete block design, if there is a certain interaction effect, then we can use ( ) to eliminate the interaction. A: Exponentiation B: Square-Root Operation C: Absolute value Operation D: Logarithm Operation

The OR operation can be produced with

Subtraction is the ______ operation of addition.