室外供热管道的供水管或蒸汽管,如设计无规定时,应敷设在热介质前进方向的( )。
A.右侧或上方 B.右侧或下方C.左侧或上方 D.左侧或下方
参考答案:A
— Jimmy never helps his mother with the housework.
— It would be _____ to say that he is lazy. [ ]
A. valuable
B. accurate
C. unfair
D. scientific
不需镁离子作激活剂的酶是
A.ALP
B.G6PD
C.CK
D.AMY
E.LD