单项选择题

Today this bell rang ________ for 10 minutes and annoyed the boss.
A、consistently
B、continually
C、continuously
D、insistently

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多项选择题

For thetransfer function of all-pass systems, which of the following statements are correct?
A、All-pass systems can be used to assist the implementation of a stable system.
B、All-pass systems can be used to assist the implementation of a linear-phase system.
C、All-pass systems can be used to assist the implementation of a minimum phase delay system in a certain magnitude characteristic.
D、All-pass systems can be used to assist the implementation of a bounded system.

多项选择题

辽宁沈阳“12·2”高层建筑火灾扑救处置经验有（）。