组装Y344封隔器水眼要装（），且保证通畅。
A.滤网
B.丝堵
C.球座
D.胶圈
参考答案：A
—_____ your telephone number?
—_____ 65883445. [ ]
A. What; It
B. What's; It's
C. What; It's
D. What's; It
It's