- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
The controlling idea in the sentence “Air pollution in Beijing is due to a number of reasons” is__________.
A、air pollution in Beijing
B、due to
C、a number of reasons
D、the reason for air pollution
B、due to
C、a number of reasons
D、the reason for air pollution
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問答題
蓄電池的電解液面正常情況下應(yīng)高于極板頂面的mm，蓄電池補(bǔ)充電解液應(yīng)在充電前或充電后進(jìn)行
答案：
1. 電解液面高度：為了確保蓄電池在充放電過程中電解液不會因溫度升高而溢出，同時保證極板完全浸沒在電解液中，電解液面需要...
