压力油系统管道应使用（）
A.铜质阀门
B.钢质阀门
C.铸铁阀门
D.丝扣阀门
参考答案：B
卵巢肿瘤最常见的组织学类型是
A．卵巢性索间质肿瘤B．转移性肿瘤C．生殖细胞肿瘤D．体腔上皮来源肿瘤E．非卵巢特异性软组织肿瘤
—______ do you think of your new lifestyle?
—_______. [ ]
A. How, It's OK.
B. What, It's OK.
C. How, Very much.
D. What, Very well
