主刹车为液控盘式刹车时，防碰天车的过卷阀在寒冷季节时，需（）试用一次，确保其性能可靠。
A.每天
B.每周
C.每班
D.每月
参考答案：A
Seeing me, Tom---- one of my old friend, walked across the street ______ to me, saying “Long time no see.”
A．holding out
B．shouting out
C．reaching out
D．stretching out
肝囊肿
