每台动力舱底泵应能通过所需的排水总管用不小于()m/s的速度抽水。
A.2
B.4
C.1.15
D.32
参考答案:A
He no longer lives on campus, for he _____ an apartment within the walking distance to the school.
A.will rent
B.rented
C.has rented
D.had rented
再生障碍性贫血的诊断主要依据是()
A.全血细胞减少
B.网织红细胞减少
C.骨髓检查
D.一般抗贫血治疗无效
E.无肝脾、淋巴结肿大