下列因素中与磁差有关的是（）。
A.航向与航速
B.时间与船位
C.吃水与载货
D.水深与船磁
参考答案：B
He also wants to know _ some way to help people swim faster. [ ]
A. is there
B. if there is
C. that there is
D. why there is
干性坏疽多发生于（）
A.肢端
B.肺
C.肾
D.脾
