【Production Version】Daily Question 2018-4-17 (Fill-in-the-blank)
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The increase in the content of inert gases in the synthetic cycle gas leads to a decrease in the space-time yield of methanol ( ) ； A certain amount of inert gas helps to maintain stable temperature control; generally, the concentration of inert gas is controlled at ()__ at the beginning of catalyst use, and at () during its later stages of use. Decline ； 20~25% ； 15~20%.
Decline ； 20~25% ； 15~20%
The increase in the inert gas content in the synthetic cycle gas leads to a (decrease) in the space-time yield of methanol； A certain amount of inert gas helps to maintain stable temperature control; generally, at the beginning of catalyst use, the concentration of inert gas is maintained at (20~25)%, while it is kept at _ (15~20)% later on.
Decline, 20%~25%, 15%~20%
Decline, 20~25%, 15~20%
The increase in the inert gas content in the synthetic cycle gas leads to a (decrease) in the space-time yield of methanol ； A certain amount of inert gas helps to maintain stable temperature control; generally, the concentration of inert gas is kept at (20–25%) during the initial stage of catalyst use, and at (15–20%) during the later stages.
Decline, 20~25%, 15~20%
Decline, (20~25)%, (15~20)%
Decrease of 20~25% 15~20%