氫氣的爆炸極限（）。
A、3%～80%B
暫無(wú)解析
She has no hostility to us, _____can be judged from her eyes
在人與自然之間的關(guān)系上，社會(huì)公德主要體現(xiàn)在熱愛(ài)自然、愛(ài)護(hù)公物上
質(zhì)量為m的質(zhì)點(diǎn)在三個(gè)外力的作用下運(yùn)動(dòng)時(shí)，其加速度為a，當(dāng)撤去其中一個(gè)外力F后，質(zhì)點(diǎn)的加速度a′=______.
One hundred miles ____(be) too far to travel on foot.
It was ________of you not to disturb us while we were sleeping
