在运用中，请问闸门门叶较常出现的毛病是（）。

A、保护涂料剥落、锈蚀

B、门叶变形

C、杆件弯曲或断裂

D、焊继开裂

An instruction is made up of operations that (68) the function to be performed and operands that represent the data to be operated on. For example, if an instruction is to perform the operation of (69) two numbers, it must know (70) the two numbers are. The processor’s job is to (71) instructions and operands from memory and to perform each operation. Having done that, it signals memory to send it (72) instruction.

A．smile

B．skip

C．smoke

D．specify