O型血的红细胞膜上含有()
A.A抗原
B.B抗原
C.O抗原
D.H抗原
E.D抗原
参考答案:D
Chinese people think a lot about food. In fact, I think that they are sometimes _____ with it.
A.modest
B.conventional
C.abundant
D.obsessed
To develop maximum anchor holding power,the optimum angle between the anchor’s shank and the mooring lines is().
A.0 degrees
B.10 degrees
C.20 degrees
D.30 degrees