高压喷射灌浆中以水气为复合喷射流,并注浆填空的是( )。
A.单管法
B.双管法
C.三管法
D.多管法
参考答案:C
It is strange that the small boy _________ work out such a difficult exercise, which is even hard to settle for adults.
A.should
B.might
C.could
D.would
与抗代谢药5-Fu化学结构相似的物质是
A.腺嘌呤
B.鸟嘌呤
C.胸腺嘧啶
D.尿嘧啶
E.胞嘧啶