报文“WACI33 ZBAA 1511430 ZBPE AIRMET 1 VALID 151520/151800 ZBAA— BEIJING CTA ISOL TS OBS N OF S50 TOP ABV FL100 STNR WKN ”中“STNR”的意思是
A.静止
B.减弱
C.加强
正确答案是A