关于密封环的错误说法是()。
A.密封环起密封与传热作用
B.搭口间隙指自由状态下的开口间隙
C.密封环会产生泵油作用
D.矩形断面的密封环应用最广
参考答案:B
纵切肾脏,两肾后部相连,应考虑()
A.游走肾
B.马蹄肾
C.肾异位
D.肾囊肿
E.肾发育不全
Although many modifications have been made in it, the game known in the United States as football can be traced directly to the English game of rugby.
A.rules
B.changes
C.demands
D.leagues