My hands are bigger than _____________. [ ]
A. he
B. his
C. him
答案:B
水环引水泵工作前应检查()是否有足够的机油。机油应保持清洁,不得有泥砂或其它固体颗粒。
在RIP协议中,默认的路由更新周期是______秒。
A.30
B.60
C.90
D.100