差压式流量表是根据节流造成压差的原理制成的。
参考答案：对
退休后个人养老金的月标准按本人退休时个人账户存储额除以（）的方法确定。
A.60
B.120
C.180
D.240
A．The governor mobilized the state’s National Guard at short notice.
B．The earthquake caused extensive damage and serious injuries.
C．The state received federal emergency funds immediately after the quake.
D．Land and air traffic, and communications were considerably affected.
