已知1纳米=10﹣9米,人的头发的直径约为6万纳米.请用科学记数法表示为( )米.[ ]
A.6×10﹣7
B.6×10﹣6
C.6×10﹣5
D.6×10﹣4
答案:C
构成右心缘第一弓的是()
A.肺动脉段
B.右心房
C.上腔静脉
D.左心耳
E.左心室
We understand you have over 20 years' experience ______ this particular line of business.
A.withB.ofC.in D.on