参加承兑行为须以汇票不获承兑，并作成拒绝证书为前提。
参考答案：对
Quite a few employees’ payments are cut down and barely cover their household ________ due to the serious economic crisis.
A．bills
B．expenses
C．prices
D．charges
油品罐的安全附件主要有( )、阻火器、放水阀、排污阀。
A．安全阀 B．呼吸阀C．泄压阀 D．报警器
