稠油的黏度与温度之间成（）关系
A、反比
B、正比
C、线性
D、非线性
参考答案：A
采用蒸汽养护的后张法鱼腹式吊车梁，其混凝土宜掺加的外加剂是( )。
A．引气剂 B．高效减水剂C．氯盐早强剂 D．引气减水剂
Without electronic computers, much of today’s advanced technology______achieveD．
A．will not have been B．have not been C．would not have been D．had not been
