诊断直肠肛管出血最常用的方法
A．选择性内脏动脉造影
B．胃X线钡餐和钡剂灌肠
C．直肠指检，内镜检查
D．小静脉造影术
E．B超
参考答案：C
--- Haven’t seen you for ages! Where have you been, anywhere?
--- I _______ to New York City. I just got back.
A．was sent
B．have been sent
C．had been sending
D．would be sent
采用公式M=d/6计算出的是（）的模数。
A.板状体
B.杆状体
C.长圆柱体
D.球体
