含碳量在0.7%至1.4%之间的钢筋为（）
A.普通低合金钢
B.低碳钢
C.中碳钢
D.高碳钢
参考答案：D
— Could you ______ me your bike please?
— Sorry , I'll use it. You can _____ Jack's. [ ]
A. borrow, lend
B. borrow, lend
C. lend, borrow
由乙酰CoA在胞质内合成一分子硬脂酸需要多少分子NADpH（）
A.14
B.16
C.9
D.7
E.18
