容量血管指的是()
A.大动脉
B.微动脉
C.肺动脉
D.毛细血管
E.静脉
参考答案:E
The news came as no surprise to me. I ______ for some time that the factory was going to shut down.
A.had known
B.knew
C.have known
D.know
强力混合机有效直径()mm。