下图中,直线BC为()
A、侧锤线
B、水平线
C、正垂线
D、侧平线
参考答案:B
选择只存在于脱氧核糖核酸中的碱基()
A.腺嘌呤
B.鸟嘌呤
C.胞嘧啶
D.胸腺嘧啶
E.尿嘧啶
When general cargo with different amounts in each draft is involved,the checker must use the ().
A.unit method
B.block method
C.straight method
D.package method