属于食管癌中晚期症状的是()属于食管癌晚期症状的是()
A.吞咽困难
B.食管内异物感
C.脱水
D.吞咽食物梗噎感
E.咽喉部干燥与紧缩感
参考答案:A,C
下列叙述正确的是[ ]
A.东经度都在东半球
B.180度经线既不在东半球,也不在西半球
C.东经170度在西经170度以东
D.本初子午线是东西经度的分界线,位于东半球
In C language,functions are important because they provide a way to __( )__code so that a large complex program can be written by combining many smaller parts.
A.modify
B.modularize
C.block
D.board