人感染丝虫的方式是（）
A.蚊吸血传播
B.由口感染
C.接触感染
D.接触了脏水
参考答案：A
Twilight City (暮光之城)is the best movie _____ I _____ in the past eight years.
A．that; have seen
B．that; saw
C．which; have seen
D．which; saw
道岔护轨轮缘宽度为（），容许误差为-1-+3mm
A.38
B.40
C.42
D.44
