煤气管道着火，不准直接向烧红的管道处打水，防止管道爆裂，要从管道远端打水，逐渐向着火处靠近，缓慢降温。
参考答案：对
The bikes produced in that factory are of high quality. So they ______ well both at home and abroad.
A．sell
B．are sold
C．may be sold
D．are to be sold
心房颤动伴三度房室传导阻滞时，R-R间期可变规整。（）
