开口销与()备件合用,用于销定其他零件。
A.弹簧
B.螺栓
C.螺母
D.槽形螺母
参考答案:D
You'll never _____ old _____ learn. [ ]
A. be so; that
B. too; to
C. so; to
D. be too; to
轻度心力衰竭患者利尿剂首选()
A.阿米洛利
B.呋塞米
C.氨苯蝶啶
D.螺内酯
E.氢氯噻嗪