燃气泄露时，闻到燃气味道后应立即打开门窗和排气扇，及时通风。
参考答案：错
5立方米40立方分米=540立方分米．______．
—I’m not finished with my dinner yet.
—But our friends for us.
A．will wait
B．wait
C．have waited
D．are waiting
