钢筋混凝土用钢筋,非合金构成,直径20mm,热轧后未经其他加工,带有轧制过程中产生的变形,直条状报验
参考答案:16(7214.2000)
Jeff goes to work _____ and his wife goes to work _____.[ ]
A. by car; on her bike
B. by a car; on her bike
C. by cars; by bike
D. by his car; by bike
酶耦联反应与一般酶反应的重要区别是()
A.有明显的延滞期
B.快速
C.准确
D.误差小
E.误差大