已知 2a +1 的平方根是±3,5a +2b -2的算术平方根是4,求3a -4b的平方根.
解:由题知
∴
That art centre is______used to be a factory,________millions of cars were made in.
A． what; which
B． where；where
C． what; where
D．where; which
磺酰脲类降糖药不具有的不良反应
A．眩晕
B．胃肠不适
C．黄疸
D．共济失调
E．口苦
