减压阀进油口与出油口接反,出口压力为()。
A、系统压力
B、为零
C、不确定
参考答案:B
红细胞升高见于()
A.甲状腺功能低下病人
B.新生儿
C.高原生活
D.吸烟者
E.肺气肿病人
On the celebration of the university’s 100th birthday, he said, “I have never experienced __________ time here as a graduate of Tsinghua University.”
A.a better
B.the best
C.the better
D.a best